From patchwork Sun Aug 4 16:44:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 14222 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 985D4449A03 for ; Sun, 4 Aug 2019 19:46:00 +0300 (EEST) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 825FB68A730; Sun, 4 Aug 2019 19:46:00 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe07-1.mx.upcmail.net (vie01a-dmta-pe07-1.mx.upcmail.net [84.116.36.17]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 8929E689B32 for ; Sun, 4 Aug 2019 19:45:53 +0300 (EEST) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-pe07.mx.upcmail.net with esmtp (Exim 4.92) (envelope-from ) id 1huJdp-0008FL-4Z for ffmpeg-devel@ffmpeg.org; Sun, 04 Aug 2019 18:45:53 +0200 Received: from localhost ([213.47.41.20]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id uJcrhrIFy5D5NuJcrh9j0i; Sun, 04 Aug 2019 18:44:53 +0200 X-Env-Mailfrom: michael@niedermayer.cc X-Env-Rcptto: ffmpeg-devel@ffmpeg.org X-SourceIP: 213.47.41.20 X-CNFS-Analysis: v=2.3 cv=bu8y+3Si c=1 sm=1 tr=0 a=I1eytVlZLDX1BM2VTtTtSw==:117 a=I1eytVlZLDX1BM2VTtTtSw==:17 a=jpOVt7BSZ2e4Z31A5e1TngXxSK0=:19 a=MKtGQD3n3ToA:10 a=1oJP67jkp3AA:10 a=GEAsPZ9sns4A:10 a=ZZnuYtJkoWoA:10 a=nZOtpAppAAAA:20 a=KzGJZuk8z8aOL3YbltIA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=SsAZrZ5W_gNWK9tOzrEV:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Sun, 4 Aug 2019 18:44:06 +0200 Message-Id: <20190804164416.23266-3-michael@niedermayer.cc> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190804164416.23266-1-michael@niedermayer.cc> References: <20190804164416.23266-1-michael@niedermayer.cc> MIME-Version: 1.0 X-CMAE-Envelope: MS4wfCUnb5khBCXYNhO44DWTHxYOkqqiyvsdQIZMlKm6J8mHvvpd4OnyKfkwXLmFzjosIJu+fI50T/cFh7+uzF1MEfBcbFEcsKetrwp9xRtd7lHH6L2ba1JC W7KQAfShqtx2+HL+nNykQsSPLdIlf6KWLM+IGuswi2ct/iCvk5yNzFQq Subject: [FFmpeg-devel] [PATCH 03/13] avcodec/mss3: Check for the rac stream being invalid in rac_normalize() 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 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Fixes: out of array read Fixes: 15982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MSA1_fuzzer-5630676251967488 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/mss3.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/libavcodec/mss3.c b/libavcodec/mss3.c index 21226f9085..02bd360996 100644 --- a/libavcodec/mss3.c +++ b/libavcodec/mss3.c @@ -298,6 +298,10 @@ static void rac_normalise(RangeCoder *c) c->got_error = 1; c->low = 1; } + if (c->low > c->range) { + c->got_error = 1; + c->low = 1; + } if (c->range >= RAC_BOTTOM) return; }