From patchwork Sun Apr 19 22:21:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 19096 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 E448044BBB7 for ; Mon, 20 Apr 2020 01:22:30 +0300 (EEST) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id D00F068B91E; Mon, 20 Apr 2020 01:22:30 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe02-2.mx.upcmail.net (vie01a-dmta-pe02-2.mx.upcmail.net [62.179.121.158]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id DEC3768B8C2 for ; Mon, 20 Apr 2020 01:22:23 +0300 (EEST) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-pe02.mx.upcmail.net with esmtp (Exim 4.92) (envelope-from ) id 1jQIKV-0001ne-0H for ffmpeg-devel@ffmpeg.org; Mon, 20 Apr 2020 00:22:23 +0200 Received: from localhost ([213.47.68.29]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id QIJWjlXNc6Jy6QIJWjdERB; Mon, 20 Apr 2020 00:21:22 +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=GKl27dFK 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=IgS27ybSsbcfe3ZoSOAA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=jd6J4Gguk5HxikPWLKER:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Mon, 20 Apr 2020 00:21:21 +0200 Message-Id: <20200419222122.7020-1-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 X-CMAE-Envelope: MS4wfDFTVR4+6HtUqvHJBj3Sqg7erc9t33AnbiCwjUJoqvc/LHq2pEdrFFfDWCzdkd/ClwN/Xs7HbyhpCS90EzHUM0qUe/vivN++MmQlHNF60S/11VJMEE9W 6TSJmxjG0VuqbqzmNrJr58STEEIGPJIedSeUtJlcGJA+lE9Z10C1va2p Subject: [FFmpeg-devel] [PATCH 1/2] avcodec/hevc_mp4toannexb_bsf: Check nalu_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: Timeout (29sec -> 5ms) Fixes: 20237/clusterfuzz-testcase-minimized-ffmpeg_BSF_HEVC_MP4TOANNEXB_fuzzer-5165615044362240 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/hevc_mp4toannexb_bsf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libavcodec/hevc_mp4toannexb_bsf.c b/libavcodec/hevc_mp4toannexb_bsf.c index baa93628ed..30f733d775 100644 --- a/libavcodec/hevc_mp4toannexb_bsf.c +++ b/libavcodec/hevc_mp4toannexb_bsf.c @@ -144,6 +144,11 @@ static int hevc_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out) for (i = 0; i < s->length_size; i++) nalu_size = (nalu_size << 8) | bytestream2_get_byte(&gb); + if (nalu_size < 2) { + ret = AVERROR_INVALIDDATA; + goto fail; + } + nalu_type = (bytestream2_peek_byte(&gb) >> 1) & 0x3f; /* prepend extradata to IRAP frames */