Fixed bug lp:917689 "Archive table corruption crashing MariaDB signal 11"

Added 'from_end' as extra parameter to Field::unpack() to detect wrong from data.
Change ha_archive::unpack_row() to detect wrong field lengths.
Replication code changed to detect wrong field information in events.


mysql-test/r/archive.result:
  dded test case for lp:917689
sql/field.cc:
  Added 'from_end' as extra parameter to Field::unpack() to detect wrong from data.
  Removed not used 'unpack_key' functions.
sql/field.h:
  Added 'from_end' as extra parameter to Field::unpack() to detect wrong from data.
  Removed not used 'unpack_key' functions.
  Removed some not needed unpack() functions.
sql/filesort.cc:
  Added buffer end parameter to unpack_addon_fields()
sql/log_event.h:
  Added end of buffer argument to unpack_row()
sql/log_event_old.cc:
  Added end of buffer argument to unpack_row()
sql/log_event_old.h:
  Added end of buffer argument to unpack_row()
sql/records.cc:
  Added buffer end parameter to unpack_addon_fields()
sql/rpl_record.cc:
  Added end of buffer argument to unpack_row()
  Added detection of wrong field information in events
sql/rpl_record.h:
  Added end of buffer argument to unpack_row()
sql/rpl_record_old.cc:
  Added end of buffer argument to unpack_row()
  Added detection of wrong field information in events
sql/rpl_record_old.h:
  Added end of buffer argument to unpack_row()
sql/table.h:
  Added buffer end parameter to unpack()
storage/archive/ha_archive.cc:
  Change ha_archive::unpack_row() to detect wrong field lengths.
  This fixes lp:917689

mysql-test/r/archive.result

@@ -12801,3 +12801,14 @@ OPTIMIZE TABLE t1;
 Table	Op	Msg_type	Msg_text
 test.t1	optimize	status	OK
 DROP TABLE t1;
+#
+# BUG#917689 Using wrong archive table causes crash
+#
+create table t1 (a int, b char(50)) engine=archive;
+select * from t1;
+ERROR HY000: Table 't1' is marked as crashed and should be repaired
+show warnings;
+Level	Code	Message
+Error	127	Got error 127 when reading table `test`.`t1`
+Error	1194	Table 't1' is marked as crashed and should be repaired
+drop table t1;

mysql-test/t/archive.test

@@ -1727,3 +1727,14 @@ CHECKSUM TABLE t1 EXTENDED;
 FLUSH TABLE t1;
 OPTIMIZE TABLE t1;
 DROP TABLE t1;
+
+--echo #
+--echo # BUG#917689 Using wrong archive table causes crash
+--echo #
+create table t1 (a int, b char(50)) engine=archive;
+--remove_file $MYSQLD_DATADIR/test/t1.ARZ
+copy_file std_data/t917689.ARZ $MYSQLD_DATADIR/test/t1.ARZ;
+--error 1194
+select * from t1;
+show warnings;
+drop table t1;

mysql-test/t/sp.test

@@ -194,12 +194,15 @@ begin
   insert into test.t1 values (x, z);
 end|
 
+let $start_value= `SELECT @@max_join_size`|
 call mixset("mixset", 19)|
 show variables like 'max_join_size'|
 select id,data,@z from t1|
 delete from t1|
 drop procedure mixset|
-
+--disable_query_log
+eval SET @@max_join_size= $start_value|
+--enable_query_log
 
 # Multiple CALL statements, one with OUT parameter.
 --disable_warnings

sql/field.cc

@@ -1472,11 +1472,13 @@ Field::pack(uchar *to, const uchar *from, uint max_length)
                        data
 
    @return  New pointer into memory based on from + length of the data
+   @return  0 if wrong data
 */
 const uchar *
-Field::unpack(uchar* to, const uchar *from, uint param_data)
+Field::unpack(uchar* to, const uchar *from, const uchar *from_end,
+              uint param_data)
 {
-  uint length=pack_length();
+  uint length=pack_length(), len;
   int from_type= 0;
   /*
     If from length is > 255, it has encoded data in the upper bits. Need
@@ -1492,14 +1494,19 @@ Field::unpack(uchar* to, const uchar *from, uint param_data)
       (length == param_data) ||
       (from_type != real_type()))
   {
+    if (from + length > from_end)
+      return 0;                                 // Error in data
+
     memcpy(to, from, length);
     return from+length;
   }
 
-  uint len= (param_data && (param_data < length)) ?
-            param_data : length;
+  len= (param_data && (param_data < length)) ? param_data : length;
 
-  memcpy(to, from, param_data > length ? length : len);
+  if (from + len > from_end)
+    return 0;                                   // Error in data
+
+  memcpy(to, from, len);
   return from+len;
 }
 
@@ -2916,10 +2923,11 @@ uint Field_new_decimal::is_equal(Create_field *new_field)
    @return  New pointer into memory based on from + length of the data
 */
 const uchar *
-Field_new_decimal::unpack(uchar* to, const uchar *from, uint param_data)
+Field_new_decimal::unpack(uchar* to, const uchar *from, const uchar *from_end,
+                          uint param_data)
 {
   if (param_data == 0)
-    return Field::unpack(to, from, param_data);
+    return Field::unpack(to, from, from_end, param_data);
 
   uint from_precision= (param_data & 0xff00) >> 8U;
   uint from_decimal= param_data & 0x00ff;
@@ -2949,7 +2957,11 @@ Field_new_decimal::unpack(uchar* to, const uchar *from, uint param_data)
     decimal2bin(&dec_val, to, precision, decimals());
   }
   else
+  {
+    if (from + len > from_end)
+      return 0;                                 // Wrong data
     memcpy(to, from, len); // Sizes are the same, just copy the data.
+  }
   return from+len;
 }
 
@@ -6542,7 +6554,8 @@ uchar *Field_string::pack(uchar *to, const uchar *from, uint max_length)
    @return  New pointer into memory based on from + length of the data
 */
 const uchar *
-Field_string::unpack(uchar *to, const uchar *from, uint param_data)
+Field_string::unpack(uchar *to, const uchar *from, const uchar *from_end,
+                     uint param_data)
 {
   uint from_length, length;
 
@@ -6564,11 +6577,19 @@ Field_string::unpack(uchar *to, const uchar *from, uint param_data)
    */
   if (from_length > 255)
   {
+    if (from + 2 > from_end)
+      return 0;
     length= uint2korr(from);
     from+= 2;
   }
   else
+  {
+    if (from + 1 > from_end)
+      return 0;
     length= (uint) *from++;
+  }
+  if (from + length > from_end || length > field_length)
+    return 0;
 
   memcpy(to, from, length);
   // Pad the string with the pad character of the fields charset
@@ -7060,6 +7081,7 @@ Field_varstring::pack_key(uchar *to, const uchar *key, uint max_length)
     Pointer to end of 'key' (To the next key part if multi-segment key)
 */
 
+#ifdef NOT_USED
 const uchar *
 Field_varstring::unpack_key(uchar *to, const uchar *key, uint max_length)
 {
@@ -7076,6 +7098,7 @@ Field_varstring::unpack_key(uchar *to, const uchar *key, uint max_length)
   memcpy(ptr + length_bytes, key, length);
   return key + length;
 }
+#endif
 
 /**
   Create a packed key that will be used for storage in the index tree.
@@ -7120,11 +7143,16 @@ uchar * Field_varstring::pack_key_from_key_image(uchar *to, const uchar *from,
    @return  New pointer into memory based on from + length of the data
 */
 const uchar *
-Field_varstring::unpack(uchar *to, const uchar *from, uint param_data)
+Field_varstring::unpack(uchar *to, const uchar *from, const uchar *from_end,
+                        uint param_data)
 {
   uint length;
   uint l_bytes= (param_data && (param_data < field_length)) ? 
                 (param_data <= 255) ? 1 : 2 : length_bytes;
+
+  if (from + l_bytes > from_end)
+    return 0;                                 // Error in data
+
   if (l_bytes == 1)
   {
     to[0]= *from++;
@@ -7139,7 +7167,11 @@ Field_varstring::unpack(uchar *to, const uchar *from, uint param_data)
     to[1]= *from++;
   }
   if (length)
+  {
+    if (from + length > from_end || length > field_length)
+      return 0;                                 // Error in data
     memcpy(to+ length_bytes, from, length);
+  }
   return from+length;
 }
 
@@ -7771,16 +7803,21 @@ uchar *Field_blob::pack(uchar *to, const uchar *from, uint max_length)
 
    @return  New pointer into memory based on from + length of the data
 */
-const uchar *Field_blob::unpack(uchar *to, const uchar *from, uint param_data)
+const uchar *Field_blob::unpack(uchar *to, const uchar *from,
+                                const uchar *from_end, uint param_data)
 {
   DBUG_ENTER("Field_blob::unpack");
   DBUG_PRINT("enter", ("to: 0x%lx; from: 0x%lx; param_data: %u",
                        (ulong) to, (ulong) from, param_data));
   uint const master_packlength=
     param_data > 0 ? param_data & 0xFF : packlength;
+  if (from + master_packlength > from_end)
+    DBUG_RETURN(0);                             // Error in data
   uint32 const length= get_length(from, master_packlength);
   DBUG_DUMP("packed", from, length + master_packlength);
   bitmap_set_bit(table->write_set, field_index);
+  if (from + master_packlength + length > from_end)
+    DBUG_RETURN(0);
   store(reinterpret_cast<const char*>(from) + master_packlength,
         length, field_charset);
   DBUG_DUMP("record", to, table->s->reclength);
@@ -7878,6 +7915,7 @@ Field_blob::pack_key(uchar *to, const uchar *from, uint max_length)
     Pointer into 'from' past the last byte copied from packed key.
 */
 
+#ifdef NOT_USED
 const uchar *
 Field_blob::unpack_key(uchar *to, const uchar *from, uint max_length)
 {
@@ -7898,7 +7936,7 @@ Field_blob::unpack_key(uchar *to, const uchar *from, uint max_length)
   /* point to first byte of next field in 'from' */
   return from + length;
 }
-
+#endif
 
 /** Create a packed key that will be used for storage from a MySQL key. */
 
@@ -8940,7 +8978,8 @@ Field_bit::pack(uchar *to, const uchar *from, uint max_length)
    @return  New pointer into memory based on from + length of the data
 */
 const uchar *
-Field_bit::unpack(uchar *to, const uchar *from, uint param_data)
+Field_bit::unpack(uchar *to, const uchar *from, const uchar *from_end,
+                  uint param_data)
 {
   uint const from_len= (param_data >> 8U) & 0x00ff;
   uint const from_bit_len= param_data & 0x00ff;
@@ -8951,6 +8990,9 @@ Field_bit::unpack(uchar *to, const uchar *from, uint param_data)
   if (param_data == 0 ||
       ((from_bit_len == bit_len) && (from_len == bytes_in_rec)))
   {
+    if (from + bytes_in_rec + test(bit_len) > from_end)
+      return 0;                                 // Error in data
+
     if (bit_len > 0)
     {
       /*
@@ -8975,10 +9017,16 @@ Field_bit::unpack(uchar *to, const uchar *from, uint param_data)
     Lastly the odd bits need to be masked out if the bytes_in_rec > 0.
     Otherwise stray bits can cause spurious values.
   */
+
+  uint len= from_len + ((from_bit_len > 0) ? 1 : 0);
   uint new_len= (field_length + 7) / 8;
+
+  if (from + len > from_end || new_len < len)
+    return 0;                                 // Error in data
+
   char *value= (char *)my_alloca(new_len);
   bzero(value, new_len);
-  uint len= from_len + ((from_bit_len > 0) ? 1 : 0);
+
   memcpy(value + (new_len - len), from, len);
   /*
     Mask out the unused bits in the partial byte. 

sql/field.h

@@ -483,17 +483,8 @@ class Field
     DBUG_RETURN(result);
   }
 
-  virtual const uchar *unpack(uchar* to, const uchar *from, uint param_data);
-  /**
-     @overload Field::unpack(uchar*, const uchar*, uint, bool)
-  */
-  const uchar *unpack(uchar* to, const uchar *from)
-  {
-    DBUG_ENTER("Field::unpack");
-    const uchar *result= unpack(to, from, 0);
-    DBUG_RETURN(result);
-  }
-
+  virtual const uchar *unpack(uchar* to, const uchar *from,
+                              const uchar *from_end, uint param_data=0);
   virtual uchar *pack_key(uchar* to, const uchar *from, uint max_length)
   {
     return pack(to, from, max_length);
@@ -502,10 +493,12 @@ class Field
   {
     return pack(to, from, max_length);
   }
+#ifdef NOT_USED
   virtual const uchar *unpack_key(uchar* to, const uchar *from, uint max_length)
   {
-    return unpack(to, from, max_length);
+    return unpack(to, from, from + max_length+2, max_length);
   }
+#endif
   virtual uint packed_col_length(const uchar *to, uint length)
   { return length;}
   virtual uint max_packed_col_length(uint max_length)
@@ -786,10 +779,6 @@ class Field_decimal :public Field_real {
   void overflow(bool negative);
   bool zero_pack() const { return 0; }
   void sql_type(String &str) const;
-  virtual const uchar *unpack(uchar* to, const uchar *from, uint param_data)
-  {
-    return Field::unpack(to, from, param_data);
-  }
   virtual uchar *pack(uchar* to, const uchar *from, uint max_length)
   {
     return Field::pack(to, from, max_length);
@@ -845,7 +834,7 @@ class Field_new_decimal :public Field_num {
   int compatible_field_size(uint field_metadata,
                             const Relay_log_info *rli, uint16 mflags);
   uint is_equal(Create_field *new_field);
-  virtual const uchar *unpack(uchar* to, const uchar *from, uint param_data);
+  virtual const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end, uint param_data);
   static Field *create_from_item (Item *);
 };
 
@@ -883,8 +872,11 @@ class Field_tiny :public Field_num {
     return to + 1;
   }
 
-  virtual const uchar *unpack(uchar* to, const uchar *from, uint param_data)
+  virtual const uchar *unpack(uchar* to, const uchar *from,
+                              const uchar *from_end, uint param_data)
   {
+    if (from == from_end)
+      return 0;
     *to= *from;
     return from + 1;
   }
@@ -928,15 +920,19 @@ class Field_short :public Field_num {
     int16 val;
     val = sint2korr(from);
     int2store(to, val);
-    return to + sizeof(val);
+    return to + 2;
   }
 
-  virtual const uchar *unpack(uchar* to, const uchar *from, uint param_data)
+  virtual const uchar *unpack(uchar* to, const uchar *from,
+                              const uchar *from_end, uint param_data)
   {
     int16 val;
+    if (from +2 > from_end)
+      return 0;
+
     val = sint2korr(from);
     int2store(to, val);
-    return from + sizeof(val);
+    return from + 2;
   }
 };
 
@@ -971,11 +967,6 @@ class Field_medium :public Field_num {
   {
     return Field::pack(to, from, max_length);
   }
-
-  virtual const uchar *unpack(uchar* to, const uchar *from, uint param_data)
-  {
-    return Field::unpack(to, from, param_data);
-  }
 };
 
 
@@ -1016,8 +1007,11 @@ class Field_long :public Field_num {
     return pack_int32(to, from);
   }
   virtual const uchar *unpack(uchar* to, const uchar *from,
+                              const uchar *from_end,
                               uint param_data __attribute__((unused)))
   {
+    if (from + 4 > from_end)
+      return 0;
     return unpack_int32(to, from);
   }
 };
@@ -1064,9 +1058,11 @@ class Field_longlong :public Field_num {
   {
     return pack_int64(to, from);
   }
-  virtual const uchar *unpack(uchar* to, const uchar *from,
-                              uint param_data __attribute__((unused)))
+  const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end,
+                      uint param_data __attribute__((unused)))
   {
+    if (from + 8 > from_end)
+      return 0;
     return unpack_int64(to, from);
   }
 };
@@ -1230,9 +1226,11 @@ class Field_timestamp :public Field_str {
   {
     return pack_int32(to, from);
   }
-  const uchar *unpack(uchar* to, const uchar *from,
+  const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end,
                       uint param_data __attribute__((unused)))
   {
+    if (from + 4 > from_end)
+      return 0;
     return unpack_int32(to, from);
   }
 };
@@ -1269,8 +1267,9 @@ class Field_timestamp_hires :public Field_timestamp {
   uint32 pack_length() const;
   uchar *pack(uchar *to, const uchar *from, uint max_length)
   { return Field::pack(to, from, max_length); }
-  const uchar *unpack(uchar* to, const uchar *from, uint param_data)
-  { return Field::unpack(to, from, param_data); }
+  const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end,
+                      uint param_data)
+  { return Field::unpack(to, from, from_end, param_data); }
   uint size_of() const { return sizeof(*this); }
   bool eq_def(Field *field)
   { return Field_str::eq_def(field) && dec == field->decimals(); }
@@ -1353,9 +1352,11 @@ class Field_date :public Field_temporal {
   {
     return pack_int32(to, from);
   }
-  const uchar *unpack(uchar* to, const uchar *from,
+  const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end,
                       uint param_data __attribute__((unused)))
   {
+    if (from + 4 > from_end)
+      return 0;
     return unpack_int32(to, from);
   }
 };
@@ -1482,9 +1483,11 @@ class Field_datetime :public Field_temporal {
   {
     return pack_int64(to, from);
   }
-  const uchar *unpack(uchar* to, const uchar *from,
+  const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end,
                       uint param_data __attribute__((unused)))
   {
+    if (from + 8 > from_end)
+      return 0;
     return unpack_int64(to, from);
   }
 };
@@ -1520,8 +1523,9 @@ class Field_datetime_hires :public Field_datetime {
   bool get_date(MYSQL_TIME *ltime,uint fuzzydate);
   uchar *pack(uchar *to, const uchar *from, uint max_length)
   { return Field::pack(to, from, max_length); }
-  const uchar *unpack(uchar* to, const uchar *from, uint param_data)
-  { return Field::unpack(to, from, param_data); }
+  const uchar *unpack(uchar* to, const uchar *from, const uchar *from_end,
+                      uint param_data)
+  { return Field::unpack(to, from, from_end, param_data); }
   uint size_of() const { return sizeof(*this); }
 };
 
@@ -1612,7 +1616,8 @@ class Field_string :public Field_longstr {
   void sql_type(String &str) const;
   virtual uchar *pack(uchar *to, const uchar *from,
                       uint max_length);
-  virtual const uchar *unpack(uchar* to, const uchar *from, uint param_data);
+  virtual const uchar *unpack(uchar* to, const uchar *from,
+                              const uchar *from_end,uint param_data);
   uint pack_length_from_metadata(uint field_metadata)
   {
     DBUG_PRINT("debug", ("field_metadata: 0x%04x", field_metadata));
@@ -1700,8 +1705,11 @@ class Field_varstring :public Field_longstr {
   virtual uchar *pack(uchar *to, const uchar *from, uint max_length);
   uchar *pack_key(uchar *to, const uchar *from, uint max_length);
   uchar *pack_key_from_key_image(uchar* to, const uchar *from, uint max_length);
-  virtual const uchar *unpack(uchar* to, const uchar *from, uint param_data);
+  virtual const uchar *unpack(uchar* to, const uchar *from,
+                              const uchar *from_end, uint param_data);
+#ifdef NOT_USED
   const uchar *unpack_key(uchar* to, const uchar *from, uint max_length);
+#endif
   int pack_cmp(const uchar *a, const uchar *b, uint key_length,
                bool insert_or_update);
   int pack_cmp(const uchar *b, uint key_length,bool insert_or_update);
@@ -1873,8 +1881,11 @@ class Field_blob :public Field_longstr {
   virtual uchar *pack(uchar *to, const uchar *from, uint max_length);
   uchar *pack_key(uchar *to, const uchar *from, uint max_length);
   uchar *pack_key_from_key_image(uchar* to, const uchar *from, uint max_length);
-  virtual const uchar *unpack(uchar *to, const uchar *from, uint param_data);
+  virtual const uchar *unpack(uchar *to, const uchar *from,
+                              const uchar *from_end, uint param_data);
+#ifdef NOT_USED
   const uchar *unpack_key(uchar* to, const uchar *from, uint max_length);
+#endif
   int pack_cmp(const uchar *a, const uchar *b, uint key_length,
                bool insert_or_update);
   int pack_cmp(const uchar *b, uint key_length,bool insert_or_update);
@@ -2077,7 +2088,8 @@ class Field_bit :public Field {
                             const Relay_log_info *rli, uint16 mflags);
   void sql_type(String &str) const;
   virtual uchar *pack(uchar *to, const uchar *from, uint max_length);
-  virtual const uchar *unpack(uchar *to, const uchar *from, uint param_data);
+  virtual const uchar *unpack(uchar *to, const uchar *from,
+                              const uchar *from_end, uint param_data);
   virtual void set_default();
 
   Field *new_key_field(MEM_ROOT *root, struct st_table *new_table,

sql/filesort.cc

@@ -60,7 +60,7 @@ static uint sortlength(THD *thd, SORT_FIELD *sortorder, uint s_length,
 static SORT_ADDON_FIELD *get_addon_fields(THD *thd, Field **ptabfield,
                                           uint sortlength, uint *plength);
 static void unpack_addon_fields(struct st_sort_addon_field *addon_field,
-                                uchar *buff);
+                                uchar *buff, uchar *buff_end);
 /**
   Sort a table.
   Creates a set of pointers that can be used to read the rows
@@ -1732,7 +1732,8 @@ get_addon_fields(THD *thd, Field **ptabfield, uint sortlength, uint *plength)
 */
 
 static void 
-unpack_addon_fields(struct st_sort_addon_field *addon_field, uchar *buff)
+unpack_addon_fields(struct st_sort_addon_field *addon_field, uchar *buff,
+                    uchar *buff_end)
 {
   Field *field;
   SORT_ADDON_FIELD *addonf= addon_field;
@@ -1745,7 +1746,7 @@ unpack_addon_fields(struct st_sort_addon_field *addon_field, uchar *buff)
       continue;
     }
     field->set_notnull();
-    field->unpack(field->ptr, buff + addonf->offset);
+    field->unpack(field->ptr, buff + addonf->offset, buff_end, 0);
   }
 }
 

sql/log_event.h

@@ -3752,7 +3752,8 @@ class Rows_log_event : public Log_event
     DBUG_ASSERT(m_table);
 
     ASSERT_OR_RETURN_ERROR(m_curr_row < m_rows_end, HA_ERR_CORRUPT_EVENT);
-    int const result= ::unpack_row(rli, m_table, m_width, m_curr_row, &m_cols,
+    int const result= ::unpack_row(rli, m_table, m_width, m_curr_row,
+                                   m_rows_end, &m_cols,
                                    &m_curr_row_end, &m_master_reclength);
     if (m_curr_row_end > m_rows_end)
       my_error(ER_SLAVE_CORRUPT_EVENT, MYF(0));

sql/log_event_old.cc

@@ -998,7 +998,8 @@ Write_rows_log_event_old::do_prepare_row(THD *thd_arg,
   int error;
   error= unpack_row_old(const_cast<Relay_log_info*>(rli),
                         table, m_width, table->record[0],
-                        row_start, &m_cols, row_end, &m_master_reclength,
+                        row_start, m_rows_end,
+                        &m_cols, row_end, &m_master_reclength,
                         table->write_set, PRE_GA_WRITE_ROWS_EVENT);
   bitmap_copy(table->read_set, table->write_set);
   return error;
@@ -1085,7 +1086,8 @@ Delete_rows_log_event_old::do_prepare_row(THD *thd_arg,
 
   error= unpack_row_old(const_cast<Relay_log_info*>(rli),
                         table, m_width, table->record[0],
-                        row_start, &m_cols, row_end, &m_master_reclength,
+                        row_start, m_rows_end,
+                        &m_cols, row_end, &m_master_reclength,
                         table->read_set, PRE_GA_DELETE_ROWS_EVENT);
   /*
     If we will access rows using the random access method, m_key will
@@ -1184,13 +1186,15 @@ int Update_rows_log_event_old::do_prepare_row(THD *thd_arg,
   /* record[0] is the before image for the update */
   error= unpack_row_old(const_cast<Relay_log_info*>(rli),
                         table, m_width, table->record[0],
-                        row_start, &m_cols, row_end, &m_master_reclength,
+                        row_start, m_rows_end,
+                        &m_cols, row_end, &m_master_reclength,
                         table->read_set, PRE_GA_UPDATE_ROWS_EVENT);
   row_start = *row_end;
   /* m_after_image is the after image for the update */
   error= unpack_row_old(const_cast<Relay_log_info*>(rli),
                         table, m_width, m_after_image,
-                        row_start, &m_cols, row_end, &m_master_reclength,
+                        row_start, m_rows_end,
+                        &m_cols, row_end, &m_master_reclength,
                         table->write_set, PRE_GA_UPDATE_ROWS_EVENT);
 
   DBUG_DUMP("record[0]", table->record[0], table->s->reclength);

sql/log_event_old.h

@@ -203,7 +203,8 @@ class Old_rows_log_event : public Log_event
   { 
     DBUG_ASSERT(m_table);
     ASSERT_OR_RETURN_ERROR(m_curr_row < m_rows_end, HA_ERR_CORRUPT_EVENT);
-    int const result= ::unpack_row(rli, m_table, m_width, m_curr_row, &m_cols,
+    int const result= ::unpack_row(rli, m_table, m_width, m_curr_row,
+                                   m_rows_end, &m_cols,
                                    &m_curr_row_end, &m_master_reclength);
     ASSERT_OR_RETURN_ERROR(m_curr_row_end <= m_rows_end, HA_ERR_CORRUPT_EVENT);
     return result;

sql/records.cc

@@ -447,7 +447,8 @@ static int rr_unpack_from_tempfile(READ_RECORD *info)
   if (my_b_read(info->io_cache, info->rec_buf, info->ref_length))
     return -1;
   TABLE *table= info->table;
-  (*table->sort.unpack)(table->sort.addon_field, info->rec_buf);
+  (*table->sort.unpack)(table->sort.addon_field, info->rec_buf,
+                        info->rec_buf + info->ref_length);
 
   return 0;
 }
@@ -498,7 +499,8 @@ static int rr_unpack_from_buffer(READ_RECORD *info)
   if (info->cache_pos == info->cache_end)
     return -1;                      /* End of buffer */
   TABLE *table= info->table;
-  (*table->sort.unpack)(table->sort.addon_field, info->cache_pos);
+  (*table->sort.unpack)(table->sort.addon_field, info->cache_pos,
+                        info->cache_end);
   info->cache_pos+= info->ref_length;
 
   return 0;

sql/rpl_record.cc

@@ -176,13 +176,15 @@ pack_row(TABLE *table, MY_BITMAP const* cols,
    @retval ER_NO_DEFAULT_FOR_FIELD
    Returned if one of the fields existing on the slave but not on the
    master does not have a default value (and isn't nullable)
-
+   @retval ER_SLAVE_CORRUPT_EVENT
+   Found error when trying to unpack fields.
  */
 #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
 int
 unpack_row(Relay_log_info const *rli,
            TABLE *table, uint const colcnt,
-           uchar const *const row_data, MY_BITMAP const *cols,
+           uchar const *const row_data, uchar const *const row_buffer_end,
+           MY_BITMAP const *cols,
            uchar const **const row_end, ulong *const master_reclength)
 {
   DBUG_ENTER("unpack_row");
@@ -224,9 +226,6 @@ unpack_row(Relay_log_info const *rli,
 
       DBUG_ASSERT(null_mask & 0xFF); // One of the 8 LSB should be set
 
-      /* Field...::unpack() cannot return 0 */
-      DBUG_ASSERT(pack_ptr != NULL);
-
       if (null_bits & null_mask)
       {
         if (f->maybe_null())
@@ -272,14 +271,21 @@ unpack_row(Relay_log_info const *rli,
 #ifndef DBUG_OFF
         uchar const *const old_pack_ptr= pack_ptr;
 #endif
-        pack_ptr= f->unpack(f->ptr, pack_ptr, metadata);
+        pack_ptr= f->unpack(f->ptr, pack_ptr, row_buffer_end, metadata);
 	DBUG_PRINT("debug", ("field: %s; metadata: 0x%x;"
                              " pack_ptr: 0x%lx; pack_ptr': 0x%lx; bytes: %d",
                              f->field_name, metadata,
                              (ulong) old_pack_ptr, (ulong) pack_ptr,
                              (int) (pack_ptr - old_pack_ptr)));
+        if (!pack_ptr)
+        {
+          rli->report(ERROR_LEVEL, ER_SLAVE_CORRUPT_EVENT,
+                      "Could not read field `%s` of table `%s`.`%s`",
+                      f->field_name, table->s->db.str,
+                      table->s->table_name.str);
+          DBUG_RETURN(ER_SLAVE_CORRUPT_EVENT);
+        }
       }
-
       null_mask <<= 1;
     }
     i++;

sql/rpl_record.h

@@ -29,7 +29,8 @@ size_t pack_row(TABLE* table, MY_BITMAP const* cols,
 #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
 int unpack_row(Relay_log_info const *rli,
                TABLE *table, uint const colcnt,
-               uchar const *const row_data, MY_BITMAP const *cols,
+               uchar const *const row_data, uchar const *row_buffer_end,
+               MY_BITMAP const *cols,
                uchar const **const row_end, ulong *const master_reclength);
 
 // Fill table's record[0] with default values.

sql/rpl_record_old.cc

@@ -82,12 +82,15 @@ pack_row_old(TABLE *table, MY_BITMAP const* cols,
       ER_NO_DEFAULT_FOR_FIELD
         Returned if one of the fields existing on the slave but not on
         the master does not have a default value (and isn't nullable)
+      ER_SLAVE_CORRUPT_EVENT
+        Wrong data for field found.
  */
 #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
 int
 unpack_row_old(Relay_log_info *rli,
                TABLE *table, uint const colcnt, uchar *record,
-               uchar const *row, MY_BITMAP const *cols,
+               uchar const *row, const uchar *row_buffer_end,
+               MY_BITMAP const *cols,
                uchar const **row_end, ulong *master_reclength,
                MY_BITMAP* const rw_set, Log_event_type const event_type)
 {
@@ -133,10 +136,16 @@ unpack_row_old(Relay_log_info *rli,
     if (bitmap_is_set(cols, field_ptr -  begin_ptr))
     {
       f->move_field_offset(offset);
-      ptr= f->unpack(f->ptr, ptr);
+      ptr= f->unpack(f->ptr, ptr, row_buffer_end, 0);
       f->move_field_offset(-offset);
-      /* Field...::unpack() cannot return 0 */
-      DBUG_ASSERT(ptr != NULL);
+      if (!ptr)
+      {
+        rli->report(ERROR_LEVEL, ER_SLAVE_CORRUPT_EVENT,
+                    "Could not read field `%s` of table `%s`.`%s`",
+                    f->field_name, table->s->db.str,
+                    table->s->table_name.str);
+        return(ER_SLAVE_CORRUPT_EVENT);
+      }
     }
     else
       bitmap_clear_bit(rw_set, field_ptr - begin_ptr);

sql/rpl_record_old.h

@@ -23,7 +23,8 @@ size_t pack_row_old(TABLE *table, MY_BITMAP const* cols,
 #ifdef HAVE_REPLICATION
 int unpack_row_old(Relay_log_info *rli,
                    TABLE *table, uint const colcnt, uchar *record,
-                   uchar const *row, MY_BITMAP const *cols,
+                   uchar const *row, uchar const *row_buffer_end,
+                   MY_BITMAP const *cols,
                    uchar const **row_end, ulong *master_reclength,
                    MY_BITMAP* const rw_set,
                    Log_event_type const event_type);

sql/sql_select.cc

@@ -15763,8 +15763,13 @@ int report_error(TABLE *table, int error)
     print them to the .err log
   */
   if (error != HA_ERR_LOCK_DEADLOCK && error != HA_ERR_LOCK_WAIT_TIMEOUT)
+  {
+    push_warning_printf(table->in_use, MYSQL_ERROR::WARN_LEVEL_ERROR, error,
+                        "Got error %d when reading table `%s`.`%s`",
+                        error, table->s->db.str, table->s->table_name.str);
     sql_print_error("Got error %d when reading table '%s'",
 		    error, table->s->path.str);
+  }
   table->file->print_error(error,MYF(0));
   return 1;
 }

sql/table.h

@@ -166,7 +166,7 @@ typedef struct st_filesort_info
   uchar     *addon_buf;         /* Pointer to a buffer if sorted with fields */
   size_t    addon_length;       /* Length of the buffer */
   struct st_sort_addon_field *addon_field;     /* Pointer to the fields info */
-  void    (*unpack)(struct st_sort_addon_field *, uchar *); /* To unpack back */
+  void    (*unpack)(struct st_sort_addon_field *, uchar *, uchar *); /* To unpack back */
   uchar     *record_pointers;    /* If sorted in memory */
   ha_rows   found_records;      /* How many records in sort */
 } FILESORT_INFO;

storage/archive/ha_archive.cc

@@ -1120,20 +1120,26 @@ int ha_archive::unpack_row(azio_stream *file_to_read, uchar *record)
 
   if (read != row_len || error)
   {
-    DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
+    DBUG_RETURN(error ? HA_ERR_CRASHED_ON_USAGE : HA_ERR_WRONG_IN_RECORD);
   }
 
   /* Copy null bits */
-  const uchar *ptr= record_buffer->buffer;
+  const uchar *ptr= record_buffer->buffer, *end= ptr+ row_len;
   memcpy(record, ptr, table->s->null_bytes);
   ptr+= table->s->null_bytes;
+  if (ptr > end)
+    DBUG_RETURN(HA_ERR_WRONG_IN_RECORD);
   for (Field **field=table->field ; *field ; field++)
   {
     if (!((*field)->is_null_in_record(record)))
     {
-      ptr= (*field)->unpack(record + (*field)->offset(table->record[0]), ptr);
+      if (!(ptr= (*field)->unpack(record + (*field)->offset(table->record[0]),
+                                  ptr, end)))
+        DBUG_RETURN(HA_ERR_WRONG_IN_RECORD);
     }
   }
+  if (ptr != end)
+    DBUG_RETURN(HA_ERR_WRONG_IN_RECORD);
   DBUG_RETURN(0);
 }