From b87781649e2862d07fcb8d322289d89b47a530b6 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 9 Mar 2021 21:39:30 +0100 Subject: [PATCH] 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 --- libavcodec/4xm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavcodec/4xm.c b/libavcodec/4xm.c index 4d58b093f7..cbd8637763 100644 --- a/libavcodec/4xm.c +++ b/libavcodec/4xm.c @@ -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; }