From patchwork Sat Mar 7 22:40:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 18085 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 97FCC44AF69 for ; Sun, 8 Mar 2020 00:47:12 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 7CE6B689248; Sun, 8 Mar 2020 00:47:12 +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 D22B0687F7A for ; Sun, 8 Mar 2020 00:47:05 +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 1jAi8f-0004Yl-0c for ffmpeg-devel@ffmpeg.org; Sat, 07 Mar 2020 23:41:45 +0100 Received: from localhost ([213.47.68.29]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id Ai7hjvIfY6Jy6Ai7hjAUgC; Sat, 07 Mar 2020 23:40:45 +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=GKl27dFK 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=RTsFw9wXut-_cpuNmgwA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=UDnyf2zBuKT2w-IlGP_r:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Sat, 7 Mar 2020 23:40:43 +0100 Message-Id: <20200307224043.12676-2-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200307224043.12676-1-michael@niedermayer.cc> References: <20200307224043.12676-1-michael@niedermayer.cc> X-CMAE-Envelope: MS4wfH6r/CF+jYpx3+WrKjUxG/maN5NPDjNlSwfKuL2EKO9XktOIKpbDjoaVTg20RKYGl7SrZaKTmFvQ/267MWbyjY095R49I56uQiI/0yps/v9FApMq56zj 6GloQoF4+2/UQ6ZHlXdPLgAU7oAH1hct/plN1SK3Tsv2ksoE1CVjNBGq Subject: [FFmpeg-devel] [PATCH 2/2] avcodec/cbs_h2645: Avoid more cases of 0 size slices 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: Assertion failure Fixes: 19629/clusterfuzz-testcase-minimized-ffmpeg_BSF_H264_METADATA_fuzzer-5676822528524288 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/cbs_h2645.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c index c8347ba5fa..7427eefa30 100644 --- a/libavcodec/cbs_h2645.c +++ b/libavcodec/cbs_h2645.c @@ -870,7 +870,8 @@ static int cbs_h264_read_nal_unit(CodedBitstreamContext *ctx, "from slice data.\n", z); len -= z; } - + if (len <= pos / 8) + return AVERROR_INVALIDDATA; slice->data_size = len - pos / 8; slice->data_ref = av_buffer_ref(unit->data_ref); if (!slice->data_ref) @@ -1052,7 +1053,8 @@ static int cbs_h265_read_nal_unit(CodedBitstreamContext *ctx, "from slice data.\n", z); len -= z; } - + if (len <= pos / 8) + return AVERROR_INVALIDDATA; slice->data_size = len - pos / 8; slice->data_ref = av_buffer_ref(unit->data_ref); if (!slice->data_ref)