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avcodec/vorbisdec: Implement vr->classifications = 1

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It appears no valid file uses this, so this is not testable with
a valid file.

Fixes: assertion failure
Fixes: 16187/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VORBIS_fuzzer-5638880618872832

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 5a5f12e3b3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-04 17:10:18 +02:00
parent 979d982bc1
commit ef938d8efd
1 changed files with 7 additions and 2 deletions
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9
libavcodec/vorbisdec.c
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@ -1361,8 +1361,12 @@ static av_always_inline int setup_classifs(vorbis_context *vc,
return AVERROR_INVALIDDATA;
}
av_assert0(vr->classifications > 1); //needed for inverse[]
if (vr->classifications == 1) {
for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
if (i < ptns_to_read)
vr->classifs[p + i] = 0;
}
} else {
for (i = partition_count + c_p_c - 1; i >= partition_count; i--) {
temp2 = (((uint64_t)temp) * inverse_class) >> 32;
@ -1370,6 +1374,7 @@ static av_always_inline int setup_classifs(vorbis_context *vc,
vr->classifs[p + i] = temp - temp2 * vr->classifications;
temp = temp2;
}
}
}
p += ptns_to_read;
}