Added TRASH_FREED_MEMORY compilation option

One can use -DTRASH_FREED_MEMORY to enable TRASH
macros. Useful to do when one suspects that there
is accesses to freed memory.

Extended my_free() to TRASH freed memory

1 files changed, 7 insertions, 0 deletions

diff --git a/mysys/my_malloc.c b/mysys/my_malloc.c
index 719c13a040e..2b34c89f5e4 100644
--- a/mysys/my_malloc.c
+++ b/mysys/my_malloc.c
@@ -214,6 +214,13 @@ void my_free(void *ptr)
     my_bool old_flags;
     old_size= MALLOC_SIZE_AND_FLAG(ptr, &old_flags);
     update_malloc_size(- (longlong) old_size - MALLOC_PREFIX_SIZE, old_flags);
+#ifndef SAFEMALLOC
+    /*
+      Trash memory if not safemalloc. We don't have to do this if safemalloc
+      is used as safemalloc will also do trashing
+    */
+    TRASH_FREE(ptr, old_size);
+#endif
     sf_free(MALLOC_FIX_POINTER_FOR_FREE(ptr));
   }
   DBUG_VOID_RETURN;