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avcodec/ac3dec: Fix null pointer dereference in ac3_decode_frame()

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Fixes: index 8 out of bounds for type 'uint8_t *[8]'
Fixes: 7273/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EAC3_fuzzer-6296497667702784

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 e3f656f2dea6ef6e2a14e72931f3d6f205f732c8)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-05-25 22:22:27 +02:00
parent f974cc9830
commit 06b84f7271
1 changed files with 3 additions and 1 deletions
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4
libavcodec/ac3dec.c
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@ -1738,7 +1738,9 @@ dependent_frame:
for (ch = 0; ch < avctx->channels; ch++) {
int map = extended_channel_map[ch];
memcpy((SHORTFLOAT *)frame->data[ch], s->output_buffer[map],
av_assert0(ch>=AV_NUM_DATA_POINTERS || frame->extended_data[ch] == frame->data[ch]);
memcpy((SHORTFLOAT *)frame->extended_data[ch],
s->output_buffer[map],
s->num_blocks * AC3_BLOCK_SIZE * sizeof(SHORTFLOAT));
}