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avcodec/qdmc: Check input space in qdmc_get_vlc()

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Fixes: Timeout (125sec -> 0.4sec)
Fixes: 18059/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QDMC_fuzzer-5656195825664000

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2c7975fe6f5c734fce9c59e8418c7f2de15a558d)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-10 18:26:44 +02:00
parent 6996d323a0
commit 0cdd0486ef
1 changed files with 2 additions and 0 deletions
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2
libavcodec/qdmc.c
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@ -365,6 +365,8 @@ static int qdmc_get_vlc(GetBitContext *gb, VLC *table, int flag)
{ {
int v; int v;
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
v = get_vlc2(gb, table->table, table->bits, 1); v = get_vlc2(gb, table->table, table->bits, 1);
if (v < 0) if (v < 0)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;