[Bf-blender-cvs] [a7542b9e2b3] master: BLI_memarena: unpoison memory before freeing it

[Jacques Lucke]

Commit: a7542b9e2b3cd2ecddbf6dfaddad9164a93720d4
Author: Jacques Lucke
Date:   Thu May 16 18:19:04 2019 +0200
Branches: master
https://developer.blender.org/rBa7542b9e2b3cd2ecddbf6dfaddad9164a93720d4

BLI_memarena: unpoison memory before freeing it

===================================================================

M	source/blender/blenlib/intern/BLI_memarena.c

===================================================================

diff --git a/source/blender/blenlib/intern/BLI_memarena.c b/source/blender/blenlib/intern/BLI_memarena.c
index b5815f7b503..0f7ac92a348 100644
--- a/source/blender/blenlib/intern/BLI_memarena.c
+++ b/source/blender/blenlib/intern/BLI_memarena.c
@@ -77,6 +77,10 @@ static void memarena_buf_free_all(struct MemBuf *mb)
 {
   while (mb != NULL) {
     struct MemBuf *mb_next = mb->next;
+
+    /* Unpoison memory because MEM_freeN might overwrite it. */
+    ASAN_UNPOISON_MEMORY_REGION(mb, (uint)MEM_allocN_len(mb));
+
     MEM_freeN(mb);
     mb = mb_next;
   }