From patchwork Fri Dec 11 10:00:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 24540 Return-Path: X-Original-To: patchwork@ffaux-bg.ffmpeg.org Delivered-To: patchwork@ffaux-bg.ffmpeg.org Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by ffaux.localdomain (Postfix) with ESMTP id 8880544A654 for ; Fri, 11 Dec 2020 12:01:10 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 5C03768A920; Fri, 11 Dec 2020 12:01:10 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe03-1.mx.upcmail.net (vie01a-dmta-pe03-1.mx.upcmail.net [62.179.121.160]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id D324968A83C for ; Fri, 11 Dec 2020 12:01:03 +0200 (EET) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-pe03.mx.upcmail.net with esmtp (Exim 4.92) (envelope-from ) id 1knfEV-0009Dk-0x for ffmpeg-devel@ffmpeg.org; Fri, 11 Dec 2020 11:01:03 +0100 Received: from localhost ([213.47.68.29]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id nfDWkNI0EO4rAnfDXktzTO; Fri, 11 Dec 2020 11:00:03 +0100 X-Env-Mailfrom: michael@niedermayer.cc X-Env-Rcptto: ffmpeg-devel@ffmpeg.org X-SourceIP: 213.47.68.29 X-CNFS-Analysis: v=2.3 cv=RNDN4Lq+ c=1 sm=1 tr=0 a=2hcxjKEKjp0CzLx6oWAm4g==:117 a=2hcxjKEKjp0CzLx6oWAm4g==:17 a=MKtGQD3n3ToA:10 a=1oJP67jkp3AA:10 a=GEAsPZ9sns4A:10 a=ZZnuYtJkoWoA:10 a=nZOtpAppAAAA:20 a=UWmNj7swS5cohyU8F3YA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=bWyr8ysk75zN3GCy5bjg:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Fri, 11 Dec 2020 11:00:01 +0100 Message-Id: <20201211100002.7202-1-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 X-CMAE-Envelope: MS4wfJa0bRaUZXHwsqQQ/+77EV3AC/C4lu/2kNv4PHs6f9U4iQ2sDbOm3pkLMpI/uNM6u8/XFKQHaW8A2Uc97ptuDdpajIiF/oBfdSUEeK2fgjRAJQC9dBgz Z7q37jRnpdahKzLjxVEAjH85P+dWICLTy2aDbnbHxhIzg3DPuChCE6Eq Subject: [FFmpeg-devel] [PATCH 1/2] avformat/iff: Check data_size X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Fixes: infinite loop Fixes: 27834/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-5694930919620608 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/iff.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavformat/iff.c b/libavformat/iff.c index f017684620..0f570e4b26 100644 --- a/libavformat/iff.c +++ b/libavformat/iff.c @@ -402,6 +402,9 @@ static int read_dst_frame(AVFormatContext *s, AVPacket *pkt) break; } + if (data_size >= INT64_MAX) + return AVERROR_INVALIDDATA; + avio_skip(pb, data_size - (avio_tell(pb) - data_pos) + (data_size & 1)); }