From: Jon Olav Hauglid
Date: November 1 2012 1:56pm
Subject: bzr push into mysql-5.6 branch (jon.hauglid:4525 to 4526) Bug#14838882
List-Archive: http://lists.mysql.com/commits/145185
X-Bug: 14838882
Message-Id: <20121101135635.30208.31876.4526@atum08.no.oracle.com>
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 4526 Jon Olav Hauglid	2012-11-01
      Bug#14838882: INIT_IO_CACHE() HAS SUSPICIOUS MEMSET()
      
      The problem was that init_io_cache() contained a memset() that with
      SAFE_MUTEX was used to clear a mutex - IO_CACHE::append_buffer_lock.
      However the size of memory cleared was the size of the IO_CACHE pointer
      rather than the size of the IO_CACHE::append_buffer_lock mutex.
      
      This patch fixes the problem by clearing the appropriate number
      of bytes.

    modified:
      mysys/mf_iocache.c
 4525 Jon Olav Hauglid	2012-11-01
      Bug#14756206: ALTER TABLE: MYSQL_CREATE_FRM DOESN'T CLEAN
                    UP PROPERLY, MEMORY LEAKED
      
      This memory leak happend if ALTER TABLE ... SET DEFAULT was
      used to set a default value for a TINY|MEDIUM|LONG BLOB|TEXT
      column.
      
      According to the manual,
      "BLOB and TEXT columns cannot be assigned a default value."
      This was true for CREATE TABLE and ALTER TABLE ADD/MODIFY
      COLUMN. However, for ALTER TABLE ... SET DEFAULT it was only
      enforced for plain BLOB|TEXT columns and not for their 
      tiny/medium/long variations.
      
      When creating the record buffer for the default values of
      blob columns (represented internally by Field_blob),
      Field_blob::free() and ~Field_blob() were never called and
      memory allocated for Field_blob::value was therefore never
      released.
      
      This patch fixes the problem by reporting
      ER_BLOB_CANT_HAVE_DEFAULT error for TINY|MEDIUM|LONG BLOB|TEXT
      columns, similarly to what is already done for BLOB|TEXT columns
      and similar to what is already done for CREATE TABLE and
      ALTER TABLE ADD/MODIFY COLUMN.
      
      Note that this also disallows ALTER TABLE ... SET DEFAULT NULL
      for geometry column types (Field_geom). Such columns are 
      not supposed to support SET DEFAULT and everything but
      SET DEFAULT NULL was already disallowed.

    modified:
      internal/mysql-test/suite/i_main/r/alter_table.result
      internal/mysql-test/suite/i_main/r/gis.result
      internal/mysql-test/suite/i_main/t/alter_table.test
      internal/mysql-test/suite/i_main/t/gis.test
      sql/sql_table.cc
      sql/unireg.cc
=== modified file 'mysys/mf_iocache.c'
--- a/mysys/mf_iocache.c	2012-07-25 09:33:25 +0000
+++ b/mysys/mf_iocache.c	2012-11-01 13:36:39 +0000
@@ -259,7 +259,7 @@ int init_io_cache(IO_CACHE *info, File f
   else
   {
     /* Clear mutex so that safe_mutex will notice that it's not initialized */
-    memset(&info->append_buffer_lock, 0, sizeof(info));
+    memset(&info->append_buffer_lock, 0, sizeof(info->append_buffer_lock));
   }
 #endif
 

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