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avcodec/tta: Fix undefined shift

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Fixes: left shift of negative value -4483
Fixes: 15256/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TTA_fuzzer-5738691617619968

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 ebccd2f778)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-16 15:55:55 +02:00
parent 58c95520ee
commit 7b9ca45a43
1 changed files with 1 additions and 1 deletions
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libavcodec/tta.c
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@ -370,7 +370,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
// shift samples for 24-bit sample format
int32_t *samples = (int32_t *)frame->data[0];
for (i = 0; i < framelen * s->channels; i++)
*samples++ <<= 8;
*samples++ *= 256;
// reset decode buffer
s->decode_buffer = NULL;
break;