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avcodec/pictordec: Check plane value before doing value/mask computations

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Fixes integer overflow
Fixes: 675/clusterfuzz-testcase-6722971232108544

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 63e400a880)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2017-02-26 20:28:00 +01:00
parent 0456e2f3e0
commit a0366ef7e7
1 changed files with 2 additions and 2 deletions
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4
libavcodec/pictordec.c
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@@ -77,10 +77,10 @@ static void picmemset(PicContext *s, AVFrame *frame, int value, int run,
if (*y < 0) {
*y = s->height - 1;
*plane += 1;
value <<= bits_per_plane;
mask <<= bits_per_plane;
if (*plane >= s->nb_planes)
return;
value <<= bits_per_plane;
mask <<= bits_per_plane;
}
}
}