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avcodec/bitstream: Check for more conflicting codes 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 e78b0f8374
commit a7e3b271fc
1 changed files with 2 additions and 1 deletions
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3
libavcodec/bitstream.c
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@ -188,8 +188,9 @@ static int build_table(VLC *vlc, int table_nb_bits, int nb_codes,
}
for (k = 0; k < nb; k++) {
int bits = table[j][1];
int oldsym = table[j][0];
ff_dlog(NULL, "%4x: code=%d n=%d\n", j, i, n);
if (bits != 0 && bits != n) {
if ((bits || oldsym) && (bits != n || oldsym != symbol)) {
av_log(NULL, AV_LOG_ERROR, "incorrect codes\n");
return AVERROR_INVALIDDATA;
}