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avcodec/g723_1dec: Clip after shift in estimate_sid_gain()

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Fixes: runtime error: left shift of 706 by 22 places cannot be represented in type 'int'
See: L_shl() in the reference software
Fixes: 1609/clusterfuzz-testcase-minimized-5102163007111168

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-20 14:16:57 +02:00
parent 1a950f32ab
commit 23868ad5cb
1 changed files with 9 additions and 3 deletions
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12
libavcodec/g723_1dec.c
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@ -660,9 +660,15 @@ static int estimate_sid_gain(G723_1_Context *p)
int i, shift, seg, seg2, t, val, val_add, x, y;
shift = 16 - p->cur_gain * 2;
if (shift > 0)
t = p->sid_gain << shift;
else
if (shift > 0) {
if (p->sid_gain == 0) {
t = 0;
} else if (shift >= 31 || (int32_t)((uint32_t)p->sid_gain << shift) >> shift != p->sid_gain) {
if (p->sid_gain < 0) t = INT32_MIN;
else t = INT32_MAX;
} else
t = p->sid_gain << shift;
}else
t = p->sid_gain >> -shift;
x = av_clipl_int32(t * (int64_t)cng_filt[0] >> 16);