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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-20 14:16:57 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-20 17:55:01 +0200 |
| commit | 23868ad5cb9b78ef95d2f71371d4f568b36218d5 (patch) | |
| tree | 1e906d2d97fd7e301125a79438c1510afe75a64f /libavcodec/g723_1dec.c | |
| parent | 1a950f32abf3bb0de7a94b26be2dfa62810ffc28 (diff) | |
| download | ffmpeg-23868ad5cb9b78ef95d2f71371d4f568b36218d5.tar.gz | |
avcodec/g723_1dec: Clip after shift in estimate_sid_gain()
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>
Diffstat (limited to 'libavcodec/g723_1dec.c')
| -rw-r--r-- | libavcodec/g723_1dec.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/libavcodec/g723_1dec.c b/libavcodec/g723_1dec.c index aaa26c24ef..c8202a937c 100644 --- a/libavcodec/g723_1dec.c +++ b/libavcodec/g723_1dec.c @@ -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); |