From patchwork Thu Apr 15 20:44:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 26945 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 6AC1444AE04 for ; Thu, 15 Apr 2021 23:51:04 +0300 (EEST) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 4C08668A6A1; Thu, 15 Apr 2021 23:51:04 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe01-3.mx.upcmail.net (vie01a-dmta-pe01-3.mx.upcmail.net [62.179.121.156]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id B918C689B7F for ; Thu, 15 Apr 2021 23:50:58 +0300 (EEST) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-pe01.mx.upcmail.net with esmtp (Exim 4.92) (envelope-from ) id 1lX8ra-00GFuw-1b for ffmpeg-devel@ffmpeg.org; Thu, 15 Apr 2021 22:45:22 +0200 Received: from localhost ([213.47.68.29]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id X8qblYVQIljeHX8qblINU5; Thu, 15 Apr 2021 22:44:21 +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=BoHjPrf5 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=VVwEGybME2WiLp7bbYwA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=GiHQeXbIydbNWtWbTz-1:22 a=p-dnK0njbqwfn1k4-x12:22 a=7aar8cbMflRChVwg8ngv:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Thu, 15 Apr 2021 22:44:20 +0200 Message-Id: <20210415204420.31613-4-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210415204420.31613-1-michael@niedermayer.cc> References: <20210415204420.31613-1-michael@niedermayer.cc> X-CMAE-Envelope: MS4wfNVpxibKcfkg6vaShm0WeS7q1U2TyZHjFU/uPRKPr8To8R/zaZMPERPhunlwIoz+CgdYyYYYVlzgz4qQtW+KN1jhISd7R0vBhT2mqO8BZQq6mHSHO+yg 14/FdOg6cz0swd/GxN1RH6W8kP+Toal90B4YDZPkJRUT3YdFBZ4BEBdM Subject: [FFmpeg-devel] [PATCH 4/4] avcodec/faxcompr: Check remaining bits on error in decode_group3_1d_line() 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 Fixes: 32886/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4779761466474496 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/faxcompr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/faxcompr.c b/libavcodec/faxcompr.c index 3dd64cf730..7bf11d80ca 100644 --- a/libavcodec/faxcompr.c +++ b/libavcodec/faxcompr.c @@ -227,7 +227,7 @@ static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb, run = 0; mode = !mode; } else if ((int)t == -1) { - if (show_bits(gb, 12) == 15) { + if (get_bits_left(gb) > 12 && show_bits(gb, 12) == 15) { int ret; skip_bits(gb, 12); ret = decode_uncompressed(avctx, gb, &pix_left, &runs, runend, &mode);