From 37396e9ba85d8969a3b5e3314ab99ff604845628 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 19 Oct 2020 17:05:01 +0200 Subject: avformat/genh: Check block_align Fixes: infinite loop Fixes: 26440/clusterfuzz-testcase-minimized-ffmpeg_dem_GENH_fuzzer-5632134020333568 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/genh.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'libavformat') diff --git a/libavformat/genh.c b/libavformat/genh.c index ed9910503d..698104a9d6 100644 --- a/libavformat/genh.c +++ b/libavformat/genh.c @@ -146,6 +146,9 @@ static int genh_read_header(AVFormatContext *s) } } + if (st->codecpar->block_align <= 0) + return AVERROR_INVALIDDATA; + avio_skip(s->pb, start_offset - avio_tell(s->pb)); avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); -- cgit v1.2.3