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avcodec/atrac9dec: Check grad_range[1] more tightly

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Alternatively the array could be made bigger but the extra values
would not be read without other changes.

Fixes: Out of array access
Fixes: 15658/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ATRAC9_fuzzer-5738260074070016

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>
(cherry picked from commit 208225bd782207aaf2b380522f96fd4fe4dc3441)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-04 00:45:20 +02:00
parent 73302b0d97
commit c1e67ca966
1 changed files with 1 additions and 1 deletions

2
libavcodec/atrac9dec.c

@ -121,7 +121,7 @@ static inline int parse_gradient(ATRAC9Context *s, ATRAC9BlockData *b,
}
b->grad_boundary = get_bits(gb, 4);
if (grad_range[0] >= grad_range[1] || grad_range[1] > 47)
if (grad_range[0] >= grad_range[1] || grad_range[1] > 31)
return AVERROR_INVALIDDATA;
if (grad_value[0] > 31 || grad_value[1] > 31)