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avcodec/adpcm: Fix left shifts in AV_CODEC_ID_ADPCM_EA

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Fixes: left shift of negative value -1
Fixes: 17683/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_EA_R2_fuzzer-5111690013704192

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 8695fbec57)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-27 12:04:57 +02:00
parent 90e449a690
commit 3f919ef19c
1 changed files with 2 additions and 2 deletions
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4
libavcodec/adpcm.c
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@ -1351,10 +1351,10 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
for (count2=0; count2<28; count2++) {
if (count2 & 1)
next_sample = sign_extend(byte, 4) << shift;
next_sample = (unsigned)sign_extend(byte, 4) << shift;
else {
byte = bytestream2_get_byte(&gb);
next_sample = sign_extend(byte >> 4, 4) << shift;
next_sample = (unsigned)sign_extend(byte >> 4, 4) << shift;
}
next_sample += (current_sample * coeff1) +