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avcodec/wmaprodec: Check offset

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Fixes: index 33280 out of bounds for type 'float [32768]'
Fixes: 18718/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XMA2_fuzzer-5635373899710464

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 5473c7825ea627a115155313a56a907d67a0d0c1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-11-12 20:06:35 +01:00
parent d35091e6fe
commit d4af9987cf
1 changed files with 5 additions and 0 deletions
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5
libavcodec/wmaprodec.c
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@ -1775,6 +1775,11 @@ static int xma_decode_packet(AVCodecContext *avctx, void *data,
ret = decode_packet(avctx, &s->xma[s->current_stream], s->frames[s->current_stream],
&got_stream_frame_ptr, avpkt);
if (got_stream_frame_ptr && s->offset[s->current_stream] >= 64) {
got_stream_frame_ptr = 0;
ret = AVERROR_INVALIDDATA;
}
/* copy stream samples (1/2ch) to sample buffer (Nch) */
if (got_stream_frame_ptr) {
int start_ch = s->start_channel[s->current_stream];