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[79.124.17.100]) by mx.google.com with ESMTP id wc22si522632ejb.39.2022.02.23.15.52.22; Wed, 23 Feb 2022 15:52:23 -0800 (PST) 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 752936800E0; Thu, 24 Feb 2022 01:52:20 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-at01-1.mx.upcmail.net (vie01a-dmta-at01-1.mx.upcmail.net [62.179.121.145]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 5FF436800E0 for ; Thu, 24 Feb 2022 01:52:13 +0200 (EET) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-at01.mx.upcmail.net with esmtp (Exim 4.92) (envelope-from ) id 1nN1Qb-00GQ4N-0w for ffmpeg-devel@ffmpeg.org; Thu, 24 Feb 2022 00:52:13 +0100 Received: from ren-mail-psmtp-mg01. ([80.109.253.241]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id N1MrnxBuBSgGFN1QbnLN6h; Thu, 24 Feb 2022 00:52:13 +0100 Received: from localhost ([213.47.68.29]) by ren-mail-psmtp-mg01. with ESMTP id N1PNnqd8NOPqFN1PNnwJp3; Thu, 24 Feb 2022 00:50:57 +0100 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=OcX7sjfY c=1 sm=1 tr=0 ts=6216c870 a=2hcxjKEKjp0CzLx6oWAm4g==:117 a=2hcxjKEKjp0CzLx6oWAm4g==:17 a=MKtGQD3n3ToA:10 a=1oJP67jkp3AA:10 a=GEAsPZ9sns4A:10 a=ZZnuYtJkoWoA:10 a=NEAV23lmAAAA:8 a=BXJ5LWMK-rI7VtkNcJgA:9 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Thu, 24 Feb 2022 00:50:55 +0100 Message-Id: <20220223235057.24625-1-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 X-CMAE-Envelope: MS4wfAnfPykMjr4vrZIpQHHsO/yKfTb3Xori/O3O14CLYg/aTA2Lz0QAqg+Qx9CBWhF7ml6izCPODOJG7G5h9SKIvIQnmmiThVkuicv9D04fnU9mYhukwjtQ JRuQiQIGLRh/zQx6uvpzqons2NYUPk7DafKls0KFUifCgJViLvdKTagM9soIrqVl9VRBXCbzcfkNeg== Subject: [FFmpeg-devel] [PATCH 1/3] tools/target_dem_fuzzer: Check fmt before dereferencing 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: bDXwX0RTkp3Z Fixes: NULL pointer dereference Fixes: 44884/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4656748688965632 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- tools/target_dem_fuzzer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/target_dem_fuzzer.c b/tools/target_dem_fuzzer.c index 687989ccc8..32767a0182 100644 --- a/tools/target_dem_fuzzer.c +++ b/tools/target_dem_fuzzer.c @@ -173,7 +173,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { } // HLS uses a loop with sleep, we thus must breakout or we timeout - if (!strcmp(fmt->name, "hls")) + if (fmt && !strcmp(fmt->name, "hls")) interrupt_counter &= 31; if (!io_buffer_size || size / io_buffer_size > maxblocks)