[FFmpeg-devel] [PATCH 03/10] avformat/mov: use 64bit for intermediate for rounding

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 03/10] avformat/mov: use 64bit for intermediate for rounding
Date: Tue, 26 Mar 2024 01:11:44 +0100
Message-ID: <20240326001151.12083-3-michael@niedermayer.cc> (raw)
In-Reply-To: <20240326001151.12083-1-michael@niedermayer.cc>

Fixes: signed integer overflow: 1768972133 + 968491058 cannot be represented in type 'int'
Fixes: 62276/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-4802790784303104

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/mov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index f954b924a02..e5e704caeb1 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -8993,7 +8993,7 @@ static int mov_read_timecode_track(AVFormatContext *s, AVStream *st)
     /* 60 fps content have tmcd_nb_frames set to 30 but tc_rate set to 60, so
      * we multiply the frame number with the quotient.
      * See tickets #9492, #9710. */
-    rounded_tc_rate = (tc_rate.num + tc_rate.den / 2) / tc_rate.den;
+    rounded_tc_rate = (tc_rate.num + tc_rate.den / 2LL) / tc_rate.den;
     /* Work around files where tmcd_nb_frames is rounded down from frame rate
      * instead of up. See ticket #5978. */
     if (tmcd_nb_frames == tc_rate.num / tc_rate.den &&
-- 
2.17.1

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