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avcodec/atrac9dec: Check q_unit_cnt in parse_band_ext()

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Fixes: global-buffer-overflow
Fixes: 15247/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ATRAC9_fuzzer-5671602181636096

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 fb4a4557d15bce601e2462207648741600fa273f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-06-16 21:01:50 +02:00
parent 3d1903acfe
commit 7daa138f68
1 changed files with 2 additions and 0 deletions
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2
libavcodec/atrac9dec.c
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@ -202,6 +202,8 @@ static inline int parse_band_ext(ATRAC9Context *s, ATRAC9BlockData *b,
int ext_band = 0;
if (b->has_band_ext) {
if (b->q_unit_cnt < 13)
return AVERROR_INVALIDDATA;
ext_band = at9_tab_band_ext_group[b->q_unit_cnt - 13][2];
if (stereo) {
b->channel[1].band_ext = get_bits(gb, 2);