From a1a277926b49dad60d9e78c6c7a8c6b5d0d6d7c9 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 25 Apr 2021 19:54:19 +0200 Subject: [PATCH] avformat/msf: Check that channels doesnt overflow during extradata construction Fixes: signed integer overflow: 2048 * 1122336 cannot be represented in type 'int' Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_MSF_fuzzer-6726959600107520 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/msf.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavformat/msf.c b/libavformat/msf.c index 43a7f7b616..7d8add387c 100644 --- a/libavformat/msf.c +++ b/libavformat/msf.c @@ -70,6 +70,8 @@ static int msf_read_header(AVFormatContext *s) case 4: case 5: case 6: st->codecpar->block_align = (codec == 4 ? 96 : codec == 5 ? 152 : 192) * st->codecpar->channels; + if (st->codecpar->channels > UINT16_MAX / 2048) + return AVERROR_INVALIDDATA; ret = ff_alloc_extradata(st->codecpar, 14); if (ret < 0) return ret;