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avcodec/atrac9dec: Check conditions before apply_band_extension() to avoid out of array read in initialization of unused variables

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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>
This commit is contained in:
Michael Niedermayer 2019-06-15 21:34:18 +02:00
parent ed4c6ce750
commit c5f265bb24
1 changed files with 3 additions and 4 deletions
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5
libavcodec/atrac9dec.c
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@ -539,9 +539,6 @@ static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b,
at9_q_unit_to_coeff_idx[g_units[3]],
};
if (!b->has_band_ext || !b->has_band_ext_data)
return;
for (int ch = 0; ch <= stereo; ch++) {
ATRAC9ChannelData *c = &b->channel[ch];
@ -751,6 +748,8 @@ static int atrac9_decode_block(ATRAC9Context *s, GetBitContext *gb,
apply_intensity_stereo(s, b, stereo);
apply_scalefactors (s, b, stereo);
if (b->has_band_ext && b->has_band_ext_data)
apply_band_extension (s, b, stereo);
imdct: