bk commit into 4.1 tree (holyfoot:1.2601) BUG#25492

[holyfoot]

Below is the list of changes that have just been committed into a local
4.1 repository of hf. When hf does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
For information on how to access the public repository
see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet@stripped, 2007-03-05 11:35:04+04:00, holyfoot@stripped +1 -0
  bug #25492 (Invalid deallocation in mysql_stmt_fetch())
  
  Additional patch.
  mysql_flush_use_result() fixed.

  libmysqld/lib_sql.cc@stripped, 2007-03-05 11:35:02+04:00, holyfoot@stripped +8 -14
    now emb_flush_use_result() uses emb_free_rows()
    duplicating code removed

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	holyfoot
# Host:	hfmain.(none)
# Root:	/home/hf/work/25492/my41-25492

--- 1.137/libmysqld/lib_sql.cc	2007-03-05 11:35:06 +04:00
+++ 1.138/libmysqld/lib_sql.cc	2007-03-05 11:35:06 +04:00
@@ -69,10 +69,14 @@ void embedded_get_error(MYSQL *mysql)
 
 static void emb_free_rows(THD *thd)
 {
+  if (!thd->data)
+    return;
+
   if (thd->current_stmt)
     free_root(&thd->data->alloc,MYF(0));
   else
     free_rows(thd->data);
+  thd->data= NULL;
 }
 
 
@@ -86,11 +90,8 @@ emb_advanced_command(MYSQL *mysql, enum 
   THD *thd=(THD *) mysql->thd;
   NET *net= &mysql->net;
 
-  if (thd->data)
-  {
-    emb_free_rows(thd);
-    thd->data= 0;
-  }
+  emb_free_rows(thd);
+
   /* Check that we are calling the client functions in right order */
   if (mysql->status != MYSQL_STATUS_READY)
   {
@@ -143,13 +144,7 @@ emb_advanced_command(MYSQL *mysql, enum 
 
 static void emb_flush_use_result(MYSQL *mysql)
 {
-  MYSQL_DATA *data= ((THD*)(mysql->thd))->data;
-
-  if (data)
-  {
-    free_rows(data);
-    ((THD*)(mysql->thd))->data= NULL;
-  }
+  emb_free_rows((THD*) (mysql->thd));
 }
 
 static MYSQL_DATA *
@@ -304,8 +299,7 @@ int emb_unbuffered_fetch(MYSQL *mysql, c
 static void emb_free_embedded_thd(MYSQL *mysql)
 {
   THD *thd= (THD*)mysql->thd;
-  if (thd->data)
-    emb_free_rows(thd);
+  emb_free_rows(thd);
   thread_count--;
   delete thd;
   mysql->thd=0;