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avcodec/atrac9dec: Check q_unit_cnt more completely before using it to access at9_tab_band_ext_group 

Fixes: index 8 out of bounds for type 'const uint8_t [8][3]'
Fixes: 19127/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ATRAC9_fuzzer-5709394985091072

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-12-03 21:33:18 +01:00
parent b7583230ae
commit e1d836d237
1 changed files with 1 additions and 1 deletions
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2
libavcodec/atrac9dec.c
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@ -199,7 +199,7 @@ 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)
if (b->q_unit_cnt < 13 || b->q_unit_cnt > 20)
return AVERROR_INVALIDDATA;
ext_band = at9_tab_band_ext_group[b->q_unit_cnt - 13][2];
if (stereo) {