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avcodec/cllc: Check num_bits

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Fixes: runtime error: shift exponent -2 is negative
Fixes: 1479/clusterfuzz-testcase-minimized-6638493360979968

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2bfd0a9758)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-11 18:39:33 +02:00
parent 7f386b5487
commit 2660338548
1 changed files with 7 additions and 0 deletions
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7
libavcodec/cllc.c
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@ -54,6 +54,13 @@ static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc)
num_lens = get_bits(gb, 5);
if (num_lens > VLC_BITS * VLC_DEPTH) {
vlc->table = NULL;
av_log(ctx->avctx, AV_LOG_ERROR, "To long VLCs %d\n", num_lens);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < num_lens; i++) {
num_codes = get_bits(gb, 9);
num_codes_sum += num_codes;