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[79.124.17.100]) by mx.google.com with ESMTP id i21-20020a170906115500b006df76385e5bsi1315783eja.763.2022.04.01.03.46.42; Fri, 01 Apr 2022 03:46:43 -0700 (PDT) Received-SPF: pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) client-ip=79.124.17.100; Authentication-Results: mx.google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id B315F68B0AD; Fri, 1 Apr 2022 13:46:38 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-at03-1.mx.upcmail.net (vie01a-dmta-at03-1.mx.upcmail.net [62.179.121.151]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 4554F68B192 for ; Fri, 1 Apr 2022 13:46:32 +0300 (EEST) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-at03.mx.upcmail.net with esmtp (Exim 4.92) (envelope-from ) id 1naEnQ-0005QH-Sr for ffmpeg-devel@ffmpeg.org; Fri, 01 Apr 2022 12:46:24 +0200 Received: from ren-mail-psmtp-mg02. ([80.109.253.241]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id aEdpnJXEwSgGFaEnQnnPQz; Fri, 01 Apr 2022 12:46:24 +0200 Received: from localhost ([213.47.68.29]) by ren-mail-psmtp-mg02. with ESMTP id aEnBnZHTH8eSWaEnBn7GzY; Fri, 01 Apr 2022 12:46:09 +0200 X-Env-Mailfrom: michael@niedermayer.cc X-Env-Rcptto: ffmpeg-devel@ffmpeg.org X-SourceIP: 213.47.68.29 X-CNFS-Analysis: v=2.4 cv=KKE5sHJo c=1 sm=1 tr=0 ts=6246d800 a=2hcxjKEKjp0CzLx6oWAm4g==:117 a=2hcxjKEKjp0CzLx6oWAm4g==:17 a=MKtGQD3n3ToA:10 a=1oJP67jkp3AA:10 a=GEAsPZ9sns4A:10 a=ZZnuYtJkoWoA:10 a=NEAV23lmAAAA:8 a=h-hOpKCbeYjIeEGYTeAA:9 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Fri, 1 Apr 2022 12:46:07 +0200 Message-Id: <20220401104608.10193-1-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 X-CMAE-Envelope: MS4wfBy+gEEsOqItpKdy5N3AWWILMNAThDL++q2ZZCArvDtHVScXjpALaoL77s+1df+z6gnykjkY7DG4F6wEFVBnhZZZD/Tbmd5wfHjBYBWMjPGtBQTzC+hP 2O9lZqqDvHhVWtQlvlIkMdml2mVLG4PQSFrWjG3zi9fRCzGKPxNF3WGBFaDw4YhJ0AL5ies4uvyB2A== Subject: [FFmpeg-devel] [PATCH 1/2] avcodec/wmalosslessdec: Check channels after setting them X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 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" X-TUID: Wf9KuTC5tKK0 Fixes: 46194/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMALOSSLESS_fuzzer-580292873827123 Fixes: stack-buffer-overflow on address 0x7ffc0ce69b30 at pc 0x00000062fb03 bp 0x7ffc0ce69af0 sp 0x7ffc0ce69ae8 Fixes: 46205/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMALOSSLESS_fuzzer-5354894996930560 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/wmalosslessdec.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/libavcodec/wmalosslessdec.c b/libavcodec/wmalosslessdec.c index d4f3462804..fd16f3f9bc 100644 --- a/libavcodec/wmalosslessdec.c +++ b/libavcodec/wmalosslessdec.c @@ -191,13 +191,6 @@ static av_cold int decode_init(AVCodecContext *avctx) return AVERROR(EINVAL); } - av_assert0(avctx->ch_layout.nb_channels >= 0); - if (avctx->ch_layout.nb_channels > WMALL_MAX_CHANNELS) { - avpriv_request_sample(avctx, - "More than " AV_STRINGIFY(WMALL_MAX_CHANNELS) " channels"); - return AVERROR_PATCHWELCOME; - } - if (avctx->extradata_size >= 18) { s->decode_flags = AV_RL16(edata_ptr + 14); channel_mask = AV_RL32(edata_ptr + 2); @@ -226,6 +219,12 @@ static av_cold int decode_init(AVCodecContext *avctx) av_channel_layout_uninit(&avctx->ch_layout); av_channel_layout_from_mask(&avctx->ch_layout, channel_mask); } + av_assert0(avctx->ch_layout.nb_channels >= 0); + if (avctx->ch_layout.nb_channels > WMALL_MAX_CHANNELS) { + avpriv_request_sample(avctx, + "More than " AV_STRINGIFY(WMALL_MAX_CHANNELS) " channels"); + return AVERROR_PATCHWELCOME; + } s->num_channels = avctx->ch_layout.nb_channels;