From patchwork Thu Feb 21 19:34:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 12134 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 EBA10448AF2 for ; Thu, 21 Feb 2019 21:36:06 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id D4B5A68AD70; Thu, 21 Feb 2019 21:36:06 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe05-3.mx.upcmail.net (vie01a-dmta-pe05-3.mx.upcmail.net [84.116.36.13]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 99B1A68AD2A for ; Thu, 21 Feb 2019 21:35:59 +0200 (EET) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-pe05.mx.upcmail.net with esmtp (Exim 4.88) (envelope-from ) id 1gwu8V-0000Kr-1x for ffmpeg-devel@ffmpeg.org; Thu, 21 Feb 2019 20:35:59 +0100 Received: from localhost ([213.47.41.20]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id wu7WgVaYL2WSswu7Wg92yn; Thu, 21 Feb 2019 20:34:58 +0100 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=E7kcWpVl c=1 sm=1 tr=0 a=I1eytVlZLDX1BM2VTtTtSw==:117 a=I1eytVlZLDX1BM2VTtTtSw==:17 a=MKtGQD3n3ToA:10 a=1oJP67jkp3AA:10 a=GEAsPZ9sns4A:10 a=ZZnuYtJkoWoA:10 a=nZOtpAppAAAA:20 a=x6UKPMLAxKh7Wu5RsFwA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=pHzHmUro8NiASowvMSCR:22 a=nt3jZW36AmriUCFCBwmW:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Thu, 21 Feb 2019 20:34:28 +0100 Message-Id: <20190221193429.19600-1-michael@niedermayer.cc> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CMAE-Envelope: MS4wfPAJu+JVeOsMe3S+bPSruyEnoiJ6xB+LR3VUVFeQ1o00yrz8qyTkmPyuz9QjFA3ZLj6DJlWlYpDjLMB3xZ/eYVqLwvQS8Ema9NuzLPBxxuCBrMP14m6A vHOgFqu4xr84zewdCOHoLqEdkdbQZ2mD4jw9k17ofUbBrzUYU0uqFpAG Subject: [FFmpeg-devel] [PATCH 1/2] avcodec/zmbv: obtain frame later 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" The frame is not needed that early so obtaining it later avoids the costly operation in case other checks fail. Fixes: Timeout (14sec -> 4sec) Fixes: 13140/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ZMBV_fuzzer-5738330308739072 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/zmbv.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/libavcodec/zmbv.c b/libavcodec/zmbv.c index 79e0892070..e07009d0fb 100644 --- a/libavcodec/zmbv.c +++ b/libavcodec/zmbv.c @@ -525,9 +525,6 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac return AVERROR_INVALIDDATA; } - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - if (c->comp == 0) { // uncompressed data if (c->decomp_size < len) { av_log(avctx, AV_LOG_ERROR, "Buffer too small\n"); @@ -553,6 +550,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac av_log(avctx, AV_LOG_ERROR, "decompressed size %d is incorrect, expected %d\n", c->decomp_len, expected_size); return AVERROR_INVALIDDATA; } + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + if (c->flags & ZMBV_KEYFRAME) { frame->key_frame = 1; frame->pict_type = AV_PICTURE_TYPE_I;