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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-11 18:39:33 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-16 16:00:23 +0200 |
| commit | 5e23b4a8396e881f68c06544fd110d8436a5b7db (patch) | |
| tree | 97e7c15f2e3dbb30484ab82a01b85bfc0fccd509 | |
| parent | becd83e164db216e0336b4f3cb7f833460da552f (diff) | |
| download | ffmpeg-5e23b4a8396e881f68c06544fd110d8436a5b7db.tar.gz | |
avcodec/cllc: Check num_bits
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 2bfd0a97587d26c0c39413a6291ccc66e4a928d0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/cllc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/libavcodec/cllc.c b/libavcodec/cllc.c index 386b2f0ed2..24fa168e36 100644 --- a/libavcodec/cllc.c +++ b/libavcodec/cllc.c @@ -55,6 +55,13 @@ 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; |