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avcodec/bitstream: Check for integer code truncation in build_table() 

Fixes: out of array read
Fixes: 14563/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5646451545210880

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 2019-06-05 12:18:54 +02:00
parent 2a0f23b9d6
commit e78b0f8374
1 changed files with 4 additions and 0 deletions
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4
libavcodec/bitstream.c
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@ -226,6 +226,10 @@ static int build_table(VLC *vlc, int table_nb_bits, int nb_codes,
/* note: realloc has been done, so reload tables */ /* note: realloc has been done, so reload tables */
table = (volatile VLC_TYPE (*)[2])&vlc->table[table_index]; table = (volatile VLC_TYPE (*)[2])&vlc->table[table_index];
table[j][0] = index; //code table[j][0] = index; //code
if (table[j][0] != index) {
avpriv_request_sample(NULL, "strange codes");
return AVERROR_PATCHWELCOME;
}
i = k-1; i = k-1;
} }
} }