Re: [FFmpeg-devel] [PATCH 7/7] avcodec/utvideodec: Fix integer overflow in decode_plane()

2020-05-11 Thread Michael Niedermayer 
On Sun, May 10, 2020 at 09:20:19PM +0200, Michael Niedermayer wrote:
> Fixes: signed integer overflow: 2147483594 + 142 cannot be represented in 
> type 'int'
> Fixes: 
> 20492/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_fuzzer-5658568101724160
> 
> Found-by: continuous fuzzing process 
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer 
> ---
>  libavcodec/utvideodec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

will apply

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[FFmpeg-devel] [PATCH 7/7] avcodec/utvideodec: Fix integer overflow in decode_plane()

2020-05-10 Thread Michael Niedermayer 
Fixes: signed integer overflow: 2147483594 + 142 cannot be represented in type 
'int'
Fixes: 
20492/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_fuzzer-5658568101724160

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer 
---
 libavcodec/utvideodec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/utvideodec.c b/libavcodec/utvideodec.c
index 4da257fc61..c07636d435 100644
--- a/libavcodec/utvideodec.c
+++ b/libavcodec/utvideodec.c
@@ -317,7 +317,7 @@ static int decode_plane(UtvideoContext *c, int plane_no,
 for (i = 0; i < width; i++) {
 pix = fsym;
 if (use_pred) {
-prev += pix;
+prev += (unsigned)pix;
 pix   = prev;
 }
 dest[i] = pix;
-- 
2.17.1

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