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avcodec/g723_1dec: fix invalid shift with negative sid_gain

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Fixes: left shift of negative value -1
Fixes: 18395/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G723_1_fuzzer-5710313034350592

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>
This commit is contained in:
Michael Niedermayer 2019-10-26 21:56:03 +02:00
parent 8b28aa0767
commit 1850c3feaa
1 changed files with 1 additions and 1 deletions
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2
libavcodec/g723_1dec.c
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@ -677,7 +677,7 @@ static int estimate_sid_gain(G723_1_ChannelContext *p)
if (p->sid_gain < 0) t = INT32_MIN; if (p->sid_gain < 0) t = INT32_MIN;
else t = INT32_MAX; else t = INT32_MAX;
} else } else
t = p->sid_gain << shift; t = p->sid_gain * (1 << shift);
} else if(shift < -31) { } else if(shift < -31) {
t = (p->sid_gain < 0) ? -1 : 0; t = (p->sid_gain < 0) ? -1 : 0;
}else }else