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 5051B47A85 for ; Fri, 29 Sep 2023 23:20:13 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id E169468CC96; Sat, 30 Sep 2023 02:20:10 +0300 (EEST) Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 9255B68CBDD for ; Sat, 30 Sep 2023 02:20:03 +0300 (EEST) Received: by mail.gandi.net (Postfix) with ESMTPSA id D700C240005 for ; Fri, 29 Sep 2023 23:20:02 +0000 (UTC) From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Sat, 30 Sep 2023 01:19:56 +0200 Message-Id: <20230929232001.23197-1-michael@niedermayer.cc> X-Mailer: git-send-email 2.17.1 X-Spam-Flag: yes X-Spam-Level: ************** X-GND-Spam-Score: 215 X-GND-Status: SPAM X-GND-Sasl: michael@niedermayer.cc Subject: [FFmpeg-devel] [PATCH 1/6] avformat/avidec: support huge durations 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: 109817402400 * 301990077 cannot be represented in type 'long long' Fixes: 51896/clusterfuzz-testcase-minimized-ffmpeg_dem_AVI_fuzzer-6706191715139584 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/avidec.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/libavformat/avidec.c b/libavformat/avidec.c index 00bd7a98a9d..cfc693842b7 100644 --- a/libavformat/avidec.c +++ b/libavformat/avidec.c @@ -27,6 +27,7 @@ #include "libavutil/avstring.h" #include "libavutil/opt.h" #include "libavutil/dict.h" +#include "libavutil/integer.h" #include "libavutil/internal.h" #include "libavutil/intreadwrite.h" #include "libavutil/mathematics.h" @@ -476,7 +477,7 @@ static int calculate_bitrate(AVFormatContext *s) AVStream *st = s->streams[i]; FFStream *const sti = ffstream(st); int64_t duration; - int64_t bitrate; + int64_t bitrate = 0; for (j = 0; j < sti->nb_index_entries; j++) len += sti->index_entries[j].size; @@ -484,7 +485,14 @@ static int calculate_bitrate(AVFormatContext *s) if (sti->nb_index_entries < 2 || st->codecpar->bit_rate > 0) continue; duration = sti->index_entries[j-1].timestamp - sti->index_entries[0].timestamp; - bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num); + if (INT64_MAX / duration >= st->time_base.num) { + bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num); + } else { + AVInteger bitrate_i = av_div_i(av_mul_i(av_int2i(8*len), av_int2i(st->time_base.den)), + av_mul_i(av_int2i(duration), av_int2i(st->time_base.num))); + if (av_cmp_i(bitrate_i, av_int2i(INT64_MAX)) <= 0) + bitrate = av_i2int(bitrate_i); + } if (bitrate > 0) { st->codecpar->bit_rate = bitrate; } -- 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".