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avcodec/shorten: Fix undefined shift in fix_bitshift()

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Fixes: left shift of negative value -9
Fixes: 8571/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5715966875926528

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 606c714823)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-06-05 13:15:34 +02:00
parent b7134d7fb6
commit c2d16aafbb
1 changed files with 1 additions and 1 deletions
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2
libavcodec/shorten.c
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@ -177,7 +177,7 @@ static void fix_bitshift(ShortenContext *s, int32_t *buffer)
buffer[i] = 0;
} else if (s->bitshift != 0) {
for (i = 0; i < s->blocksize; i++)
buffer[i] <<= s->bitshift;
buffer[i] *= 1 << s->bitshift;
}
}