Re: [FFmpeg-devel] [PATCH] avcodec/diracdec: Fix integer overflow in global_mv()

[Michael Niedermayer]

On Wed, May 22, 2019 at 02:35:46AM +0200, Michael Niedermayer wrote:
> Fixes: signed integer overflow: 16384 * 196607 cannot be represented in type 
> 'int'
> Fixes: 
> 14810/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5091232683917312
> 
> Found-by: continuous fuzzing process 
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer 
> ---
>  libavcodec/diracdec.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

will apply

[...]
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[FFmpeg-devel] [PATCH] avcodec/diracdec: Fix integer overflow in global_mv()

[Michael Niedermayer]

Fixes: signed integer overflow: 16384 * 196607 cannot be represented in type 
'int'
Fixes: 
14810/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5091232683917312

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer 
---
 libavcodec/diracdec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c
index a5bb6d5f34..643e3a7753 100644
--- a/libavcodec/diracdec.c
+++ b/libavcodec/diracdec.c
@@ -1433,8 +1433,8 @@ static void global_mv(DiracContext *s, DiracBlock *block, 
int x, int y, int ref)
 int *c  = s->globalmc[ref].perspective;
 
 int64_t m   = (1> (ez+ep);
 block->u.mv[ref][1] = (my + (1<<(ez+ep))) >> (ez+ep);
-- 
2.21.0

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