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avcodec/atrac3plus: Check split point in fill mode 3 

Fixes: index 32 out of bounds for type 'int [32]'
Fixes: 18350/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ATRAC3P_fuzzer-5643794862571520

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 2019-10-22 22:02:32 +02:00
parent 55c97a7637
commit de5102fd92
1 changed files with 4 additions and 0 deletions
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4
libavcodec/atrac3plus.c
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@ -456,6 +456,10 @@ static int decode_channel_wordlen(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
} else if (chan->fill_mode == 3) {
pos = ch_num ? chan->num_coded_vals + chan->split_point
: ctx->num_quant_units - chan->split_point;
if (pos > FF_ARRAY_ELEMS(chan->qu_wordlen)) {
av_log(avctx, AV_LOG_ERROR, "Split point beyond array\n");
pos = FF_ARRAY_ELEMS(chan->qu_wordlen);
}
for (i = chan->num_coded_vals; i < pos; i++)
chan->qu_wordlen[i] = 1;
}