[FFmpeg-cvslog] avutil/mem: Also poison new av_realloc-allocated blocks

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Mon Apr 26 18:34:31 2021 +0200| [8b83a4a885e3b92bd09354d6cb182fca47f80973] | committer: Andreas Rheinhardt

avutil/mem: Also poison new av_realloc-allocated blocks

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8b83a4a885e3b92bd09354d6cb182fca47f80973
---

 libavutil/mem.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/libavutil/mem.c b/libavutil/mem.c
index cfb6d8ab8f..fa227f5e12 100644
--- a/libavutil/mem.c
+++ b/libavutil/mem.c
@@ -133,14 +133,20 @@ void *av_malloc(size_t size)
 
 void *av_realloc(void *ptr, size_t size)
 {
+    void *ret;
     if (size > max_alloc_size)
         return NULL;
 
 #if HAVE_ALIGNED_MALLOC
-    return _aligned_realloc(ptr, size + !size, ALIGN);
+    ret = _aligned_realloc(ptr, size + !size, ALIGN);
 #else
-    return realloc(ptr, size + !size);
+    ret = realloc(ptr, size + !size);
 #endif
+#if CONFIG_MEMORY_POISONING
+    if (ret && !ptr)
+        memset(ret, FF_MEMORY_POISON, size);
+#endif
+    return ret;
 }
 
 void *av_realloc_f(void *ptr, size_t nelem, size_t elsize)