Fix for bug #6266 "Invalid DATETIME value is not handled properly".

In server we assume that datetime values stored in MYSQL_TIME struct
are normalized (and year is not greater than 9999), so we should 
perform range checks in all places then we convert something to
MYSQL_TIME. 


include/my_time.h:
  Added one more argument to set_zero_time() function to make it more 
  convinient.
  Added comment clarifying why MAX_DATE_STRING_REP_LENGTH value is 30.
include/mysql_time.h:
  Documented MySQL's internal assumptions for members of MYSQL_TIME
  structure.
libmysql/libmysql.c:
  It does not make sense to set MYSQL_TIME::time_type twice in case of 
  errors.
mysql-test/r/type_datetime.result:
  Added test for bug #6266 "Invalid DATETIME value not handled properly".
mysql-test/t/type_datetime.test:
  Added test for bug #6266 "Invalid DATETIME value not handled properly".
sql-common/my_time.c:
  str_to_datetime(): Added missing check for too big year values.
  set_zero_time(): added time_type argument, since MYSQL_TIMESTAMP_NONE
    is not the value that we want in most cases.
sql/field.cc:
  Field_datetime::store_time():
    clarified why we don't perform any range checks here.
sql/item.cc:
  Item_param::set_time():
   Added comment describing this method and range checking for TIME
   values.
sql/sql_prepare.cc:
  Removed comments about range checking for TIME values in prepared 
  statements, which are no longer true.
  set_zero_time() has one more argument now.
tests/client_test.c:
  Added test for bug #6266 "Invalid DATETIME value not handled properly"

include/my_time.h

@@ -58,14 +58,15 @@ void init_time(void);
 my_time_t 
 my_system_gmt_sec(const MYSQL_TIME *t, long *my_timezone, bool *in_dst_time_gap);
 
-void set_zero_time(MYSQL_TIME *tm);
+void set_zero_time(MYSQL_TIME *tm, enum enum_mysql_timestamp_type time_type);
 
 /*
   Required buffer length for my_time_to_str, my_date_to_str,
   my_datetime_to_str and TIME_to_string functions. Note, that the
   caller is still responsible to check that given TIME structure
   has values in valid ranges, otherwise size of the buffer could
-  be not enough.
+  be not enough. We also rely on the fact that even wrong values
+  sent using binary protocol fit in this buffer.
 */
 #define MAX_DATE_STRING_REP_LENGTH 30
 

include/mysql_time.h

@@ -33,6 +33,18 @@ enum enum_mysql_timestamp_type
 };
 
 
+/*
+  Structure which is used to represent datetime values inside MySQL.
+
+  We assume that values in this structure are normalized, i.e. year <= 9999,
+  month <= 12, day <= 31, hour <= 23, hour <= 59, hour <= 59. Many functions
+  in server such as my_system_gmt_sec() or make_time() family of functions
+  rely on this (actually now usage of make_*() family relies on a bit weaker
+  restriction). Also functions that produce MYSQL_TIME as result ensure this.
+  There is one exception to this rule though if this structure holds time
+  value (time_type == MYSQL_TIMESTAMP_TIME) days and hour member can hold
+  bigger values.
+*/
 typedef struct st_mysql_time
 {
   unsigned int  year, month, day, hour, minute, second;

libmysql/libmysql.c

@@ -3256,11 +3256,12 @@ static void read_binary_time(MYSQL_TIME *tm, uchar **pos)
       tm->hour+= tm->day*24;
       tm->day= 0;
     }
+    tm->time_type= MYSQL_TIMESTAMP_TIME;
+
     *pos+= length;
   }
   else
-    set_zero_time(tm);
-  tm->time_type= MYSQL_TIMESTAMP_TIME;
+    set_zero_time(tm, MYSQL_TIMESTAMP_TIME);
 }
 
 static void read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
@@ -3285,12 +3286,12 @@ static void read_binary_datetime(MYSQL_TIME *tm, uchar **pos)
     else
       tm->hour= tm->minute= tm->second= 0;
     tm->second_part= (length > 7) ? (ulong) sint4korr(to+7) : 0;
+    tm->time_type= MYSQL_TIMESTAMP_DATETIME;
 
     *pos+= length;
   }
   else
-    set_zero_time(tm);
-  tm->time_type= MYSQL_TIMESTAMP_DATETIME;
+    set_zero_time(tm, MYSQL_TIMESTAMP_DATETIME);
 }
 
 static void read_binary_date(MYSQL_TIME *tm, uchar **pos)
@@ -3307,12 +3308,12 @@ static void read_binary_date(MYSQL_TIME *tm, uchar **pos)
     tm->hour= tm->minute= tm->second= 0;
     tm->second_part= 0;
     tm->neg= 0;
+    tm->time_type= MYSQL_TIMESTAMP_DATE;
 
     *pos+= length;
   }
   else
-    set_zero_time(tm);
-  tm->time_type= MYSQL_TIMESTAMP_DATE;
+    set_zero_time(tm, MYSQL_TIMESTAMP_DATE);
 }
 
 

mysql-test/r/type_datetime.result

@@ -97,13 +97,15 @@ select * from t1 where a is null or b is null;
 a	b
 drop table t1;
 create table t1 (t datetime);
-insert into t1 values (20030102030460),(20030102036301),(20030102240401),(20030132030401),(20031302030460);
+insert into t1 values (20030102030460),(20030102036301),(20030102240401),
+(20030132030401),(20031302030401),(100001202030401);
 Warnings:
 Warning	1265	Data truncated for column 't' at row 1
 Warning	1265	Data truncated for column 't' at row 2
 Warning	1265	Data truncated for column 't' at row 3
 Warning	1265	Data truncated for column 't' at row 4
 Warning	1265	Data truncated for column 't' at row 5
+Warning	1265	Data truncated for column 't' at row 6
 select * from t1;
 t
 0000-00-00 00:00:00
@@ -111,14 +113,18 @@ t
 0000-00-00 00:00:00
 0000-00-00 00:00:00
 0000-00-00 00:00:00
+0000-00-00 00:00:00
 delete from t1;
-insert into t1 values ("20030102030460"),("20030102036301"),("20030102240401"),("20030132030401"),("20031302030460");
+insert into t1 values
+("2003-01-02 03:04:60"),("2003-01-02 03:63:01"),("2003-01-02 24:04:01"),
+("2003-01-32 03:04:01"),("2003-13-02 03:04:01"), ("10000-12-02 03:04:00");
 Warnings:
 Warning	1264	Data truncated; out of range for column 't' at row 1
 Warning	1264	Data truncated; out of range for column 't' at row 2
 Warning	1264	Data truncated; out of range for column 't' at row 3
 Warning	1264	Data truncated; out of range for column 't' at row 4
 Warning	1264	Data truncated; out of range for column 't' at row 5
+Warning	1264	Data truncated; out of range for column 't' at row 6
 select * from t1;
 t
 0000-00-00 00:00:00
@@ -126,6 +132,7 @@ t
 0000-00-00 00:00:00
 0000-00-00 00:00:00
 0000-00-00 00:00:00
+0000-00-00 00:00:00
 delete from t1;
 insert into t1 values ("0000-00-00 00:00:00 some trailer"),("2003-01-01 00:00:00 some trailer");
 Warnings:

mysql-test/t/type_datetime.test

@@ -77,10 +77,13 @@ drop table t1;
 # warnings (for both strings and numbers)
 #
 create table t1 (t datetime);
-insert into t1 values (20030102030460),(20030102036301),(20030102240401),(20030132030401),(20031302030460);
+insert into t1 values (20030102030460),(20030102036301),(20030102240401),
+                      (20030132030401),(20031302030401),(100001202030401);
 select * from t1;
 delete from t1;
-insert into t1 values ("20030102030460"),("20030102036301"),("20030102240401"),("20030132030401"),("20031302030460");
+insert into t1 values
+  ("2003-01-02 03:04:60"),("2003-01-02 03:63:01"),("2003-01-02 24:04:01"),
+  ("2003-01-32 03:04:01"),("2003-13-02 03:04:01"), ("10000-12-02 03:04:00");
 select * from t1;
 delete from t1;
 insert into t1 values ("0000-00-00 00:00:00 some trailer"),("2003-01-01 00:00:00 some trailer");

sql-common/my_time.c

@@ -343,7 +343,8 @@ str_to_datetime(const char *str, uint length, MYSQL_TIME *l_time,
       (l_time->month || l_time->day))
     l_time->year+= (l_time->year < YY_PART_YEAR ? 2000 : 1900);
 
-  if (number_of_fields < 3 || l_time->month > 12 ||
+  if (number_of_fields < 3 ||
+      l_time->year > 9999 || l_time->month > 12 ||
       l_time->day > 31 || l_time->hour > 23 ||
       l_time->minute > 59 || l_time->second > 59 ||
       (!(flags & TIME_FUZZY_DATE) && (l_time->month == 0 || l_time->day == 0)))
@@ -720,10 +721,10 @@ my_system_gmt_sec(const MYSQL_TIME *t, long *my_timezone, bool *in_dst_time_gap)
 
 /* Set MYSQL_TIME structure to 0000-00-00 00:00:00.000000 */
 
-void set_zero_time(MYSQL_TIME *tm)
+void set_zero_time(MYSQL_TIME *tm, enum enum_mysql_timestamp_type time_type)
 {
   bzero((void*) tm, sizeof(*tm));
-  tm->time_type= MYSQL_TIMESTAMP_NONE;
+  tm->time_type= time_type;
 }
 
 

sql/field.cc

@@ -4086,6 +4086,10 @@ int Field_datetime::store(longlong nr)
 void Field_datetime::store_time(TIME *ltime,timestamp_type type)
 {
   longlong tmp;
+  /*
+    We don't perform range checking here since values stored in TIME
+    structure always fit into DATETIME range.
+  */
   if (type == MYSQL_TIMESTAMP_DATE || type == MYSQL_TIMESTAMP_DATETIME)
     tmp=((ltime->year*10000L+ltime->month*100+ltime->day)*LL(1000000)+
 	 (ltime->hour*10000L+ltime->minute*100+ltime->second));

sql/item.cc

@@ -837,6 +837,21 @@ void Item_param::set_double(double d)
 }
 
 
+/*
+  Set parameter value from TIME value.
+
+  SYNOPSIS
+    set_time()
+      tm             - datetime value to set (time_type is ignored)
+      type           - type of datetime value
+      max_length_arg - max length of datetime value as string
+
+  NOTE
+    If we value to be stored is not normalized, zero value will be stored
+    instead and proper warning will be produced. This function relies on
+    the fact that even wrong value sent over binary protocol fits into
+    MAX_DATE_STRING_REP_LENGTH buffer.
+*/
 void Item_param::set_time(TIME *tm, timestamp_type type, uint32 max_length_arg)
 { 
   DBUG_ENTER("Item_param::set_time");
@@ -844,6 +859,17 @@ void Item_param::set_time(TIME *tm, timestamp_type type, uint32 max_length_arg)
   value.time= *tm;
   value.time.time_type= type;
 
+  if (value.time.year > 9999 || value.time.month > 12 ||
+      value.time.day > 31 ||
+      type != MYSQL_TIMESTAMP_TIME && value.time.hour > 23 ||
+      value.time.minute > 59 || value.time.second > 59)
+  {
+    char buff[MAX_DATE_STRING_REP_LENGTH];
+    uint length= my_TIME_to_str(&value.time, buff);
+    make_truncated_value_warning(current_thd, buff, length, type);
+    set_zero_time(&value.time, MYSQL_TIMESTAMP_ERROR);
+  }
+
   state= TIME_VALUE;
   maybe_null= 0;
   max_length= max_length_arg;

sql/sql_prepare.cc

@@ -349,12 +349,6 @@ static void set_param_time(Item_param *param, uchar **pos, ulong len)
 
     tm.neg= (bool) to[0];
     day= (uint) sint4korr(to+1);
-    /*
-      Note, that though ranges of hour, minute and second are not checked
-      here we rely on them being < 256: otherwise
-      we'll get buffer overflow in make_{date,time} functions,
-      which are called when time value is converted to string.
-    */
     tm.hour=   (uint) to[5] + day * 24;
     tm.minute= (uint) to[6];
     tm.second= (uint) to[7];
@@ -369,7 +363,7 @@ static void set_param_time(Item_param *param, uchar **pos, ulong len)
     tm.day= tm.year= tm.month= 0;
   }
   else
-    set_zero_time(&tm);
+    set_zero_time(&tm, MYSQL_TIMESTAMP_TIME);
   param->set_time(&tm, MYSQL_TIMESTAMP_TIME,
                   MAX_TIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
   *pos+= length;
@@ -388,11 +382,6 @@ static void set_param_datetime(Item_param *param, uchar **pos, ulong len)
     tm.year=   (uint) sint2korr(to);
     tm.month=  (uint) to[2];
     tm.day=    (uint) to[3];
-    /*
-      Note, that though ranges of hour, minute and second are not checked
-      here we rely on them being < 256: otherwise
-      we'll get buffer overflow in make_{date,time} functions.
-    */
     if (length > 4)
     {
       tm.hour=   (uint) to[4];
@@ -405,7 +394,7 @@ static void set_param_datetime(Item_param *param, uchar **pos, ulong len)
     tm.second_part= (length > 7) ? (ulong) sint4korr(to+7) : 0;
   }
   else
-    set_zero_time(&tm);
+    set_zero_time(&tm, MYSQL_TIMESTAMP_DATETIME);
   param->set_time(&tm, MYSQL_TIMESTAMP_DATETIME,
                   MAX_DATETIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
   *pos+= length;
@@ -419,11 +408,7 @@ static void set_param_date(Item_param *param, uchar **pos, ulong len)
   if (length >= 4)
   {
     uchar *to= *pos;
-    /*
-      Note, that though ranges of hour, minute and second are not checked
-      here we rely on them being < 256: otherwise
-      we'll get buffer overflow in make_{date,time} functions.
-    */
+
     tm.year=  (uint) sint2korr(to);
     tm.month=  (uint) to[2];
     tm.day= (uint) to[3];
@@ -433,7 +418,7 @@ static void set_param_date(Item_param *param, uchar **pos, ulong len)
     tm.neg= 0;
   }
   else
-    set_zero_time(&tm);
+    set_zero_time(&tm, MYSQL_TIMESTAMP_DATE);
   param->set_time(&tm, MYSQL_TIMESTAMP_DATE,
                   MAX_DATE_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
   *pos+= length;

tests/client_test.c

@@ -11088,6 +11088,139 @@ static void test_bug6096()
 }
 
 
+/*
+  Test of basic checks that are performed in server for components
+  of MYSQL_TIME parameters.
+ */
+static void test_datetime_ranges()
+{
+  const char *stmt_text;
+  int rc, i;
+  MYSQL_STMT *stmt;
+  MYSQL_BIND bind[6];
+  MYSQL_TIME tm[6];
+
+  myheader("test_datetime_ranges");
+
+  stmt_text= "drop table if exists t1";
+  rc= mysql_real_query(mysql, stmt_text, strlen(stmt_text));
+  myquery(rc);
+
+  stmt_text= "create table t1 (year datetime, month datetime, day datetime, "
+                              "hour datetime, min datetime, sec datetime)";
+  rc= mysql_real_query(mysql, stmt_text, strlen(stmt_text));
+  myquery(rc);
+
+  stmt= mysql_simple_prepare(mysql,
+                             "INSERT INTO t1 VALUES (?, ?, ?, ?, ?, ?)");
+  check_stmt(stmt);
+  verify_param_count(stmt, 6);
+
+  bzero(bind, sizeof(bind));
+  for (i= 0; i < 6; i++)
+  {
+    bind[i].buffer_type= MYSQL_TYPE_DATETIME;
+    bind[i].buffer= &tm[i];
+  }
+  rc= mysql_stmt_bind_param(stmt, bind);
+  check_execute(stmt, rc);
+
+  tm[0].year= 2004; tm[0].month= 11; tm[0].day= 10;
+  tm[0].hour= 12; tm[0].minute= 30; tm[0].second= 30;
+  tm[0].second_part= 0; tm[0].neg= 0;
+
+  tm[5]= tm[4]= tm[3]= tm[2]= tm[1]= tm[0];
+  tm[0].year= 10000;  tm[1].month= 13; tm[2].day= 32;
+  tm[3].hour= 24; tm[4].minute= 60; tm[5].second= 60;
+
+  rc= mysql_stmt_execute(stmt);
+  check_execute(stmt, rc);
+  DIE_UNLESS(mysql_warning_count(mysql) != 6);
+
+  verify_col_data("t1", "year", "0000-00-00 00:00:00");
+  verify_col_data("t1", "month", "0000-00-00 00:00:00");
+  verify_col_data("t1", "day", "0000-00-00 00:00:00");
+  verify_col_data("t1", "hour", "0000-00-00 00:00:00");
+  verify_col_data("t1", "min", "0000-00-00 00:00:00");
+  verify_col_data("t1", "sec", "0000-00-00 00:00:00");
+
+  mysql_stmt_close(stmt);
+
+  stmt_text= "delete from t1";
+  rc= mysql_real_query(mysql, stmt_text, strlen(stmt_text));
+  myquery(rc);
+
+  stmt= mysql_simple_prepare(mysql, "INSERT INTO t1 (year, month, day) "
+                                    "VALUES (?, ?, ?)");
+  check_stmt(stmt);
+  verify_param_count(stmt, 3);
+
+  /*
+    We reuse contents of bind and tm arrays left from previous part of test.
+  */
+  for (i= 0; i < 3; i++)
+    bind[i].buffer_type= MYSQL_TYPE_DATE;
+
+  rc= mysql_stmt_bind_param(stmt, bind);
+  check_execute(stmt, rc);
+
+  rc= mysql_stmt_execute(stmt);
+  check_execute(stmt, rc);
+  DIE_UNLESS(mysql_warning_count(mysql) != 3);
+
+  verify_col_data("t1", "year", "0000-00-00 00:00:00");
+  verify_col_data("t1", "month", "0000-00-00 00:00:00");
+  verify_col_data("t1", "day", "0000-00-00 00:00:00");
+
+  mysql_stmt_close(stmt);
+
+  stmt_text= "drop table t1";
+  rc= mysql_real_query(mysql, stmt_text, strlen(stmt_text));
+  myquery(rc);
+
+  stmt_text= "create table t1 (day_ovfl time, day time, hour time, min time, sec time)";
+  rc= mysql_real_query(mysql, stmt_text, strlen(stmt_text));
+  myquery(rc);
+
+  stmt= mysql_simple_prepare(mysql,
+                             "INSERT INTO t1 VALUES (?, ?, ?, ?, ?)");
+  check_stmt(stmt);
+  verify_param_count(stmt, 5);
+
+  /*
+    Again we reuse what we can from previous part of test.
+  */
+  for (i= 0; i < 5; i++)
+    bind[i].buffer_type= MYSQL_TYPE_TIME;
+
+  rc= mysql_stmt_bind_param(stmt, bind);
+  check_execute(stmt, rc);
+
+  tm[0].year= 0; tm[0].month= 0; tm[0].day= 10;
+  tm[0].hour= 12; tm[0].minute= 30; tm[0].second= 30;
+  tm[0].second_part= 0; tm[0].neg= 0;
+
+  tm[4]= tm[3]= tm[2]= tm[1]= tm[0];
+  tm[0].day= 35; tm[1].day= 34; tm[2].hour= 30; tm[3].minute= 60; tm[4].second= 60;
+
+  rc= mysql_stmt_execute(stmt);
+  check_execute(stmt, rc);
+  DIE_UNLESS(mysql_warning_count(mysql) != 2);
+
+  verify_col_data("t1", "day_ovfl", "838:59:59");
+  verify_col_data("t1", "day", "828:30:30");
+  verify_col_data("t1", "hour", "270:30:30");
+  verify_col_data("t1", "min", "00:00:00");
+  verify_col_data("t1", "sec", "00:00:00");
+
+  mysql_stmt_close(stmt);
+
+  stmt_text= "drop table t1";
+  rc= mysql_real_query(mysql, stmt_text, strlen(stmt_text));
+  myquery(rc);
+}
+
+
 /*
   Read and parse arguments and MySQL options from my.cnf
 */
@@ -11404,6 +11537,8 @@ int main(int argc, char **argv)
     test_bug6046();         /* NATURAL JOIN transformation works in PS */
     test_bug6081();         /* test of mysql_create_db()/mysql_rm_db() */
     test_bug6096();         /* max_length for numeric columns */
+    test_datetime_ranges(); /* Test if basic checks are performed for
+                               components of MYSQL_TIME parameters */
     /*
       XXX: PLEASE RUN THIS PROGRAM UNDER VALGRIND AND VERIFY THAT YOUR TEST
       DOESN'T CONTAIN WARNINGS/ERRORS BEFORE YOU PUSH.