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avcodec/g723_1dec: Fix runtime error: left shift of negative value -1

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Fixes: 1504/clusterfuzz-testcase-minimized-6249212138225664

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 c4c0245686bc2fcc545644101c7b328fed71f268)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-12 13:13:46 +02:00
parent 9f0f354a97
commit bf7bcd803a
1 changed files with 2 additions and 2 deletions
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4
libavcodec/g723_1dec.c
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@ -694,13 +694,13 @@ static int estimate_sid_gain(G723_1_Context *p)
if (y <= 0) {
t = seg * 32 + (val + 1 << seg2);
t = t * t - x;
val = (seg2 - 1 << 4) + val;
val = (seg2 - 1) * 16 + val;
if (t >= y)
val++;
} else {
t = seg * 32 + (val - 1 << seg2);
t = t * t - x;
val = (seg2 - 1 << 4) + val;
val = (seg2 - 1) * 16 + val;
if (t >= y)
val--;
}