Bug#12361113: CRASH WHEN "LOAD INDEX INTO CACHE" WITH TOO

SMALL KEY CACHE

The server crashed on division by zero because the key cache was not
initialized and the block length was 0 which was used in a division.

The fix was to not allow CACHE INDEX if the key cache was not initiallized.
Thus never try LOAD INDEX INTO CACHE for an uninitialized key cache.

Also added some windows files/directories to .bzrignore.

.bzrignore

@@ -8,6 +8,7 @@
 *.core
 *.d
 *.da
+*.dir
 *.exe
 *.gcda
 *.gcno
@@ -25,6 +26,7 @@
 *.pdb
 *.reject
 *.res
+*.rule
 *.sbr
 *.so
 *.so.*
@@ -32,13 +34,19 @@
 *.user
 *.vcproj
 *.vcproj.cmake
+*.vcxproj
+*.vcxproj.filters
 */*.dir/*
+Debug
+MySql.sdf
+Win32
 */*_pure_*warnings
 */.deps
 */.libs/*
 */.pure
 */debug/*
 */release/*
+RelWithDebInfo
 *~
 .*.swp
 ./CMakeCache.txt
@@ -83,6 +91,7 @@ BitKeeper/tmp/*
 BitKeeper/tmp/bkr3sAHD
 BitKeeper/tmp/gone
 CMakeFiles/*
+CMakeFiles
 COPYING
 COPYING.LIB
 Docs/#manual.texi#

myisam/mi_preload.c

@@ -54,6 +54,9 @@ int mi_preload(MI_INFO *info, ulonglong key_map, my_bool ignore_leaves)
   if (!keys || !mi_is_any_key_active(key_map) || key_file_length == pos)
     DBUG_RETURN(0);
 
+  /* Preload into a non initialized key cache should never happen. */
+  DBUG_ASSERT(share->key_cache->key_cache_inited);
+
   block_length= keyinfo[0].block_length;
 
   if (ignore_leaves)

mysql-test/r/key_cache.result

@@ -368,3 +368,19 @@ Variable_name	Value
 key_cache_block_size	1536
 SET GLOBAL key_cache_block_size= @bug28478_key_cache_block_size;
 DROP TABLE t1;
+#
+# Bug#12361113: crash when load index into cache
+#
+# Note that this creates an empty disabled key cache!
+SET GLOBAL key_cache_none.key_cache_block_size = 1024;
+CREATE TABLE t1 (a INT, b INTEGER NOT NULL, KEY (b) ) ENGINE = MYISAM;
+INSERT INTO t1 VALUES (1, 1);
+CACHE INDEX t1 in key_cache_none;
+ERROR HY000: Unknown key cache 'key_cache_none'
+# The bug crashed the server at LOAD INDEX below. Now it will succeed 
+# since the default cache is used due to CACHE INDEX failed for
+# key_cache_none.
+LOAD INDEX INTO CACHE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	preload_keys	status	OK
+DROP TABLE t1;

mysql-test/t/key_cache.test

@@ -247,3 +247,19 @@ SET GLOBAL key_cache_block_size= @bug28478_key_cache_block_size;
 DROP TABLE t1;
 
 # End of 4.1 tests
+
+--echo #
+--echo # Bug#12361113: crash when load index into cache
+--echo #
+
+--echo # Note that this creates an empty disabled key cache!
+SET GLOBAL key_cache_none.key_cache_block_size = 1024;
+CREATE TABLE t1 (a INT, b INTEGER NOT NULL, KEY (b) ) ENGINE = MYISAM;
+INSERT INTO t1 VALUES (1, 1);
+--error ER_UNKNOWN_KEY_CACHE
+CACHE INDEX t1 in key_cache_none;
+--echo # The bug crashed the server at LOAD INDEX below. Now it will succeed 
+--echo # since the default cache is used due to CACHE INDEX failed for
+--echo # key_cache_none.
+LOAD INDEX INTO CACHE t1;
+DROP TABLE t1;

sql/sql_table.cc

@@ -2680,6 +2680,11 @@ bool mysql_assign_to_keycache(THD* thd, TABLE_LIST* tables,
     DBUG_RETURN(TRUE);
   }
   pthread_mutex_unlock(&LOCK_global_system_variables);
+  if (!key_cache->key_cache_inited)
+  {
+    my_error(ER_UNKNOWN_KEY_CACHE, MYF(0), key_cache_name->str);
+    DBUG_RETURN(TRUE);
+  }
   check_opt.key_cache= key_cache;
   DBUG_RETURN(mysql_admin_table(thd, tables, &check_opt,
 				"assign_to_keycache", TL_READ_NO_INSERT, 0, 0,