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avcodec/4xm: Check pre_gb in decode_i_block() 

Fixes: Timeout
Fixes: 31257/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FOURXM_fuzzer-5150866229297152

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 2021-03-09 21:39:30 +01:00
parent 1ad628d2c2
commit b87781649e
1 changed files with 2 additions and 2 deletions
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4
libavcodec/4xm.c
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@ -499,8 +499,8 @@ static int decode_i_block(FourXContext *f, int16_t *block)
{
int code, i, j, level, val;
if (get_bits_left(&f->gb) < 2){
av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb));
if (get_bits_left(&f->pre_gb) < 2) {
av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->pre_gb));
return AVERROR_INVALIDDATA;
}