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avcodec/dxtory: Fix negative stride shift in dx2_decode_slice_420()

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Fixes: left shift of negative value -640
Fixes: 26044/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXTORY_fuzzer-5631057602543616

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 3291d994b7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-02 14:59:13 +02:00
parent ef3fee893d
commit d9b610ee71
1 changed files with 1 additions and 1 deletions
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2
libavcodec/dxtory.c
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@ -487,7 +487,7 @@ static int dx2_decode_slice_420(GetBitContext *gb, AVFrame *frame,
V[x >> 1] = decode_sym(gb, lru[2]) ^ 0x80;
}
Y += ystride << 1;
Y += ystride * 2;
U += ustride;
V += vstride;
}