[Bf-blender-cvs] [f76b537d486] master: Fix T99744: NULL pointer free with corrupt zSTD reading

[Campbell Barton]

Commit: f76b537d486029fc8ad5bf3bf9b122bc4b3c9d89
Author: Campbell Barton
Date:   Sat Jul 16 16:32:36 2022 +1000
Branches: master
https://developer.blender.org/rBf76b537d486029fc8ad5bf3bf9b122bc4b3c9d89

Fix T99744: NULL pointer free with corrupt zSTD reading

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

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

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

diff --git a/source/blender/blenlib/intern/filereader_zstd.c b/source/blender/blenlib/intern/filereader_zstd.c
index 5f114f24fb0..aeb000e9754 100644
--- a/source/blender/blenlib/intern/filereader_zstd.c
+++ b/source/blender/blenlib/intern/filereader_zstd.c
@@ -281,7 +281,10 @@ static void zstd_close(FileReader *reader)
   if (zstd->reader.seek) {
     MEM_freeN(zstd->seek.uncompressed_ofs);
     MEM_freeN(zstd->seek.compressed_ofs);
-    MEM_freeN(zstd->seek.cached_content);
+    /* When an error has occurred this may be NULL, see: T99744. */
+    if (zstd->seek.cached_content) {
+      MEM_freeN(zstd->seek.cached_content);
+    }
   }
   else {
     MEM_freeN((void *)zstd->in_buf.src);