From patchwork Wed Sep 4 16:04:57 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 14905 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 69F6E447A0B for ; Wed, 4 Sep 2019 19:17:03 +0300 (EEST) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 4004268804E; Wed, 4 Sep 2019 19:17:03 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe06-1.mx.upcmail.net (vie01a-dmta-pe06-1.mx.upcmail.net [84.116.36.14]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id B1B1968803C for ; Wed, 4 Sep 2019 19:16:56 +0300 (EEST) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-pe06.mx.upcmail.net with esmtp (Exim 4.92) (envelope-from ) id 1i5XnO-00099r-7X for ffmpeg-devel@ffmpeg.org; Wed, 04 Sep 2019 18:06:10 +0200 Received: from localhost ([213.47.41.20]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id 5XmIiF6LSwlys5XmIibUUm; Wed, 04 Sep 2019 18:05:02 +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=cvzpyi7Lwih4E3DDp7sA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=UDnyf2zBuKT2w-IlGP_r:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Wed, 4 Sep 2019 18:04:57 +0200 Message-Id: <20190904160458.28245-4-michael@niedermayer.cc> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190904160458.28245-1-michael@niedermayer.cc> References: <20190904160458.28245-1-michael@niedermayer.cc> MIME-Version: 1.0 X-CMAE-Envelope: MS4wfDtAcLfDsO2VkcVeE3A84NRHFmmh6qaX/fvYIEtAxK5AqjGX3FO8u+SJsa/eJR4H1x0U+6Sfv+qq/0NQ0AmHtdG2Tny/H4xwVz2Bx2/rbNXKT77/MZ7+ 9/h2a9W29LFqi7h6taL0xiJSGJSyNjmfTj4ZRte8MeOxVUw94J9LlU7V Subject: [FFmpeg-devel] [PATCH 4/5] avformat/vividas: Check n_sb_blocks against input space 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: OOM Fixes: 16726/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5719320750981120 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/vividas.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/libavformat/vividas.c b/libavformat/vividas.c index 645e322b6e..7ccec85761 100644 --- a/libavformat/vividas.c +++ b/libavformat/vividas.c @@ -420,7 +420,7 @@ static int track_header(VividasDemuxContext *viv, AVFormatContext *s, uint8_t * return 0; } -static void track_index(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *buf, unsigned size) +static int track_index(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *buf, unsigned size) { int64_t off; int64_t poff; @@ -430,16 +430,21 @@ static void track_index(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *b pb = avio_alloc_context(buf, size, 0, NULL, NULL, NULL, NULL); if (!pb) - return; + return AVERROR(ENOMEM); ffio_read_varlen(pb); // track_index_len avio_r8(pb); // 'c' viv->n_sb_blocks = ffio_read_varlen(pb); + if (viv->n_sb_blocks * 2 > size) { + viv->n_sb_blocks = 0; + av_free(pb); + return AVERROR_INVALIDDATA; + } viv->sb_blocks = av_calloc(viv->n_sb_blocks, sizeof(VIV_SB_block)); if (!viv->sb_blocks) { viv->n_sb_blocks = 0; av_free(pb); - return; + return AVERROR(ENOMEM); } off = 0; @@ -462,6 +467,8 @@ static void track_index(VividasDemuxContext *viv, AVFormatContext *s, uint8_t *b viv->sb_entries = av_calloc(maxnp, sizeof(VIV_SB_entry)); av_free(pb); + + return 0; } static void load_sb_block(AVFormatContext *s, VividasDemuxContext *viv, unsigned expected_size) @@ -587,8 +594,10 @@ static int viv_read_header(AVFormatContext *s) buf = read_vblock(pb, &v, key, &k2, v); if (!buf) return AVERROR(EIO); - track_index(viv, s, buf, v); + ret = track_index(viv, s, buf, v); av_free(buf); + if (ret < 0) + return ret; viv->sb_offset = avio_tell(pb); if (viv->n_sb_blocks > 0) {