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Code Issues Releases Activity

avcodec/4xm: Check pre_gb in decode_i_block()

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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>
(cherry picked from commit b87781649e2862d07fcb8d322289d89b47a530b6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-03-09 21:39:30 +01:00
parent a0bda2923b
commit 6505b2f7a8
1 changed files with 2 additions and 2 deletions
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4
libavcodec/4xm.c
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@ -498,8 +498,8 @@ static int decode_i_block(FourXContext *f, int16_t *block)
{ {
int code, i, j, level, val; int code, i, j, level, val;
if (get_bits_left(&f->gb) < 2){ 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->gb)); av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->pre_gb));
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }