From patchwork Sat Aug 1 23:23:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 21441 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 95759449C61 for ; Sun, 2 Aug 2020 02:24:32 +0300 (EEST) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 6CE5A68B66D; Sun, 2 Aug 2020 02:24:32 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe05-1.mx.upcmail.net (vie01a-dmta-pe05-1.mx.upcmail.net [84.116.36.11]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 11C43689D89 for ; Sun, 2 Aug 2020 02:24:26 +0300 (EEST) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-pe05.mx.upcmail.net with esmtp (Exim 4.92) (envelope-from ) id 1k20rZ-0000Ry-0B for ffmpeg-devel@ffmpeg.org; Sun, 02 Aug 2020 01:24:25 +0200 Received: from localhost ([213.47.68.29]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id 20qakbXvVIr7G20qakduLT; Sun, 02 Aug 2020 01:23:24 +0200 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=QN4WuTDL 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=ZVeswqwFfe7-s_zsvEQA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=bWyr8ysk75zN3GCy5bjg:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Sun, 2 Aug 2020 01:23:22 +0200 Message-Id: <20200801232323.8962-1-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 X-CMAE-Envelope: MS4wfG9h4QOuYUftUkR0/YyBceDiOnDRS+619aobGqOLrcWmBJVBOTKdJIJeX4ac7DiHbb46G3F+V1B+u1n3GSGnOMA+HNng+rpMy0USOxMmBHKhoelM0xMI TSz2vE/HQnmksx2+SOHZNcPBxUGrTfMzZk3me68TA6wuAlF3D4KYYjli Subject: [FFmpeg-devel] [PATCH 1/2] avformat/mov: Check comp_brand_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: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int' Fixes: 24457/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5760093644390400 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/mov.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/mov.c b/libavformat/mov.c index d16840f3df..1532e74d67 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -1108,7 +1108,7 @@ static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom) av_dict_set_int(&c->fc->metadata, "minor_version", minor_ver, 0); comp_brand_size = atom.size - 8; - if (comp_brand_size < 0) + if (comp_brand_size < 0 || comp_brand_size == INT_MAX) return AVERROR_INVALIDDATA; comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */ if (!comp_brands_str)