[FFmpeg-devel] [PATCH 1/2] avcodec/vc2enc_dwt: Avoid NULL - 0

[Andreas Rheinhardt]

It is sane, but UB. It could happen in case of allocation errors
in vc2_encode_init().

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>
---
 libavcodec/vc2enc_dwt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/vc2enc_dwt.c b/libavcodec/vc2enc_dwt.c
index a8d3f1c669..441af040ec 100644
--- a/libavcodec/vc2enc_dwt.c
+++ b/libavcodec/vc2enc_dwt.c
@@ -276,6 +276,8 @@ av_cold int ff_vc2enc_init_transforms(VC2TransformContext *s, int p_stride,
 
 av_cold void ff_vc2enc_free_transforms(VC2TransformContext *s)
 {
-    av_free(s->buffer - s->padding);
-    s->buffer = NULL;
+    if (s->buffer) {
+        av_free(s->buffer - s->padding);
+        s->buffer = NULL;
+    }
 }
-- 
2.32.0