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avcodec/wmavoice: Fix integer overflow in synth_frame()

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Fixes: left shift of negative value -3
Fixes: 18518/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMAVOICE_fuzzer-6560514359951360

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-11-02 15:15:46 +01:00
parent 5634e20525
commit cf323f4d38
1 changed files with 1 additions and 1 deletions
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libavcodec/wmavoice.c
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@ -1523,7 +1523,7 @@ static int synth_frame(AVCodecContext *ctx, GetBitContext *gb, int frame_idx,
/* "pitch-diff-per-sample" for calculation of pitch per sample */ /* "pitch-diff-per-sample" for calculation of pitch per sample */
s->pitch_diff_sh16 = s->pitch_diff_sh16 =
((cur_pitch_val - s->last_pitch_val) << 16) / MAX_FRAMESIZE; (cur_pitch_val - s->last_pitch_val) * (1 << 16) / MAX_FRAMESIZE;
} }
/* Global gain (if silence) and pitch-adaptive window coordinates */ /* Global gain (if silence) and pitch-adaptive window coordinates */