[PR] avformat/mov: avoid overflow/negative discard sample duration (PR #23696)

PR #23696 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23696
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23696.patch

Fixes: 525566001/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5952332261818368
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <[email protected]>



>From f6d6dfcc6a7c6caca27eaa5472bc1118d8cafbd5 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <[email protected]>
Date: Fri, 3 Jul 2026 04:47:40 +0200
Subject: [PATCH] avformat/mov: avoid overflow/negative discard sample duration

Fixes: 525566001/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5952332261818368
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <[email protected]>
---
 libavformat/mov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 90b01f9499..119be34006 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -11661,7 +11661,7 @@ static int mov_finalize_packet(AVFormatContext *s, AVStream *st, AVIndexEntry *s
         int64_t duration = pkt->duration;
 
         if (av_sat_add64(pkt->pts, pkt->duration) > st->duration)
-            duration = st->duration - pkt->pts;
+            duration = FFMAX(av_sat_sub64(st->duration, pkt->pts), 0);
         duration = av_rescale_q(duration, st->time_base, (AVRational){ 1, st->codecpar->sample_rate });
 
         if (!ffstream(st)->first_discard_sample)
-- 
2.52.0

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