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

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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.
This commit is contained in:
Mattias Jonsson 2011-12-12 14:07:02 +01:00
parent b079cea72e
commit ba8c33f5ec
5 changed files with 49 additions and 0 deletions
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9
.bzrignore
View File

@ -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#

3
myisam/mi_preload.c
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@ -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)

16
mysql-test/r/key_cache.result
View File

@ -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;

16
mysql-test/t/key_cache.test
View File

@ -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;

5
sql/sql_table.cc
View File

@ -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,