Merged with mysql-5.1 tree.

client/mysqltest.cc:
  Manually merged
configure.in:
  Manually merged
mysql-test/r/variables.result:
  Manually merged
mysql-test/t/variables.test:
  Manually merged
mysys/my_pread.c:
  Manually merged
mysys/my_read.c:
  Manually merged
sql/mysqld.cc:
  Manually merged
storage/csv/ha_tina.h:
  Manually merged
storage/myisam/ha_myisam.cc:
  Manually merged
storage/myisam/mi_check.c:
  Manually merged
storage/myisam/mi_search.c:
  Manually merged

1 files changed, 9 insertions, 4 deletions

diff --git a/mysys/my_error.c b/mysys/my_error.c
index 7f9850ac94d..4e04d4fadc2 100644
--- a/mysys/my_error.c
+++ b/mysys/my_error.c
@@ -276,11 +276,16 @@ const char **my_error_unregister(int first, int last)
 
 void my_error_unregister_all(void)
 {
-  struct my_err_head    *list, *next;
-  for (list= my_errmsgs_globerrs.meh_next; list; list= next)
+  struct my_err_head *cursor, *saved_next;
+
+  for (cursor= my_errmsgs_globerrs.meh_next; cursor != NULL; cursor= saved_next)
   {
-    next= list->meh_next;
-    my_free((uchar*) list, MYF(0));
+    /* We need this ptr, but we're about to free its container, so save it. */
+    saved_next= cursor->meh_next;
+
+    my_free((uchar*) cursor, MYF(0));
   }
+  my_errmsgs_globerrs.meh_next= NULL;  /* Freed in first iteration above. */
+
   my_errmsgs_list= &my_errmsgs_globerrs;
 }