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avcodec/mvha: Check remaining space when reading VLC table probabilities 

Fixes: Infinite loop
Fixes: 19183/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MVHA_fuzzer-5666216765292544

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>
This commit is contained in:
Michael Niedermayer 2019-12-06 00:07:17 +01:00
parent 5ee4c12ec2
commit e7011a0ca6
1 changed files with 3 additions and 0 deletions
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3
libavcodec/mvha.c
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@ -203,6 +203,9 @@ static int decode_frame(AVCodecContext *avctx,
for (int i = 0; i < s->nb_symbols; symbol++) { for (int i = 0; i < s->nb_symbols; symbol++) {
int prob; int prob;
if (get_bits_left(gb) < 4)
return AVERROR_INVALIDDATA;
if (get_bits1(gb)) { if (get_bits1(gb)) {
prob = get_bits(gb, 12); prob = get_bits(gb, 12);
} else { } else {