From patchwork Thu Feb 6 13:45:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 17702 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 11F6644A5B5 for ; Thu, 6 Feb 2020 15:54:22 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 0117968AE90; Thu, 6 Feb 2020 15:54:21 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe05-3.mx.upcmail.net (vie01a-dmta-pe05-3.mx.upcmail.net [84.116.36.13]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id D5BE068A297 for ; Thu, 6 Feb 2020 15:54:15 +0200 (EET) 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 1izhUY-0003Tm-0e for ffmpeg-devel@ffmpeg.org; Thu, 06 Feb 2020 14:46:50 +0100 Received: from localhost ([213.47.68.29]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id zhTaikzH8wlyszhTaiqtF7; Thu, 06 Feb 2020 14:45:50 +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=E5OzWpVl c=1 sm=1 tr=0 a=2hcxjKEKjp0CzLx6oWAm4g==:117 a=2hcxjKEKjp0CzLx6oWAm4g==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=MKtGQD3n3ToA:10 a=1oJP67jkp3AA:10 a=GEAsPZ9sns4A:10 a=ZZnuYtJkoWoA:10 a=nZOtpAppAAAA:20 a=iMHDJZBxuDV8VnUHyNMA:9 a=VlZU0XKO32wA:10 a=1fhp2MxaeJtTNGEnv6mo:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=SsAZrZ5W_gNWK9tOzrEV:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Thu, 6 Feb 2020 14:45:48 +0100 Message-Id: <20200206134549.29792-2-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200206134549.29792-1-michael@niedermayer.cc> References: <20200206134549.29792-1-michael@niedermayer.cc> X-CMAE-Envelope: MS4wfFwA78vCgbOiv+iR/WA4X1DNwiECwNw0srYfdh4cZV8D3Zqk5869y/oqNbVEM1oareqYp5PA6vcKcI9G9UD9xUB4RFdWU20RR0puyFJZ3W9gSeg4mGhQ KYvrpSF9clzo1CQkPqvAGobWMlw76ICal6Zj6LLekL3oirAuRKbFOGNW Subject: [FFmpeg-devel] [PATCH 2/3] avformat/tty: Fix division by 0 in probe 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: division by zero Fixes: 20436/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5763229752229888 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/tty.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavformat/tty.c b/libavformat/tty.c index 60f7e9f87e..854a23c500 100644 --- a/libavformat/tty.c +++ b/libavformat/tty.c @@ -53,6 +53,9 @@ static int read_probe(const AVProbeData *p) { int cnt = 0; + if (!p->buf_size) + return 0; + for (int i = 0; i < p->buf_size; i++) cnt += !!isansicode(p->buf[i]);