From patchwork Thu Aug 15 21:49:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 14532 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 825CF449D03 for ; Fri, 16 Aug 2019 00:51:16 +0300 (EEST) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 727E668AC6B; Fri, 16 Aug 2019 00:51:16 +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 5084068A9C9 for ; Fri, 16 Aug 2019 00:51:07 +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 1hyNeE-0004Sz-5Q for ffmpeg-devel@ffmpeg.org; Thu, 15 Aug 2019 23:51:06 +0200 Received: from localhost ([213.47.41.20]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id yNdGhl1ClwlysyNdGhkGHw; Thu, 15 Aug 2019 23:50:06 +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=E5OzWpVl 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=5NVwuS01NtY6kS3RJRAA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=UDnyf2zBuKT2w-IlGP_r:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Thu, 15 Aug 2019 23:49:10 +0200 Message-Id: <20190815214915.909-2-michael@niedermayer.cc> X-Mailer: git-send-email 2.22.1 In-Reply-To: <20190815214915.909-1-michael@niedermayer.cc> References: <20190815214915.909-1-michael@niedermayer.cc> MIME-Version: 1.0 X-CMAE-Envelope: MS4wfFuqHsq09bJVsLeTLq39JY7nijpLuOk6iW9au17aLoX1ra+Dsf9iZbpbzo4mLyhFsm9UjpcjnFgwp2wlnyMldUGptwgMwmD8ZWdsgeGe15aEx6rPzjMp s2hKlXI1p6tj1Zq8I8vGESkXn5m0zUnRqJ7Z1bKaBk+gPaNw1MIPyxP2 Subject: [FFmpeg-devel] [PATCH 2/7] avcodec/vc1_block: Check for double escapes 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: 16331/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3IMAGE_fuzzer-5672735195267072 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/vc1_block.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c index 94184b0873..775e3c516b 100644 --- a/libavcodec/vc1_block.c +++ b/libavcodec/vc1_block.c @@ -526,7 +526,7 @@ static int vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int escape = decode210(gb); if (escape != 2) { index = get_vlc2(gb, ff_vc1_ac_coeff_table[codingset].table, AC_VLC_BITS, 3); - if (index < 0) + if (index >= ff_vc1_ac_sizes[codingset] - 1U) return AVERROR_INVALIDDATA; run = vc1_index_decode_table[codingset][index][0]; level = vc1_index_decode_table[codingset][index][1];