From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id 2FD9945CD9 for ; Sat, 30 Sep 2023 22:31:12 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id ADB3E68CD49; Sun, 1 Oct 2023 01:30:56 +0300 (EEST) Received: from relay9-d.mail.gandi.net (relay9-d.mail.gandi.net [217.70.183.199]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 1D06168CD3A for ; Sun, 1 Oct 2023 01:30:50 +0300 (EEST) Received: by mail.gandi.net (Postfix) with ESMTPSA id 73777FF805 for ; Sat, 30 Sep 2023 22:30:49 +0000 (UTC) From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Sun, 1 Oct 2023 00:30:34 +0200 Message-Id: <20230930223046.22896-3-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230930223046.22896-1-michael@niedermayer.cc> References: <20230930223046.22896-1-michael@niedermayer.cc> X-GND-Sasl: michael@niedermayer.cc Subject: [FFmpeg-devel] [PATCH 03/15] avformat/jacosubdec: avoid signed integer overflows in get_shift() 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Fixes: signed integer overflow: 22014562800 * 934633746 cannot be represented in type 'long' Fixes: 51896/clusterfuzz-testcase-minimized-ffmpeg_dem_JACOSUB_fuzzer-5189603246866432 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/jacosubdec.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/libavformat/jacosubdec.c b/libavformat/jacosubdec.c index 42c201f93af..41216081ee0 100644 --- a/libavformat/jacosubdec.c +++ b/libavformat/jacosubdec.c @@ -124,7 +124,7 @@ shift_and_ret: return buf + len; } -static int get_shift(int timeres, const char *buf) +static int get_shift(unsigned timeres, const char *buf) { int sign = 1; int a = 0, b = 0, c = 0, d = 0; @@ -148,7 +148,11 @@ static int get_shift(int timeres, const char *buf) case 3: d = c; c = b; b = a; a = 0; } - ret = sign * (((int64_t)a*3600 + (int64_t)b*60 + c) * timeres + d); + ret = (int64_t)a*3600 + (int64_t)b*60 + c; + if (FFABS(ret) > (INT64_MAX - FFABS(d)) / timeres) + return 0; + ret = sign * (ret * timeres + d); + if ((int)ret != ret) ret = 0; -- 2.17.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".