Commit de5102fd authored by Michael Niedermayer's avatar Michael Niedermayer

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/ffmpegSigned-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
parent 55c97a76
...@@ -456,6 +456,10 @@ static int decode_channel_wordlen(GetBitContext *gb, Atrac3pChanUnitCtx *ctx, ...@@ -456,6 +456,10 @@ static int decode_channel_wordlen(GetBitContext *gb, Atrac3pChanUnitCtx *ctx,
} else if (chan->fill_mode == 3) { } else if (chan->fill_mode == 3) {
pos = ch_num ? chan->num_coded_vals + chan->split_point pos = ch_num ? chan->num_coded_vals + chan->split_point
: ctx->num_quant_units - 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++) for (i = chan->num_coded_vals; i < pos; i++)
chan->qu_wordlen[i] = 1; chan->qu_wordlen[i] = 1;
} }
......
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