From: michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Cc: michaelni <code@ffmpeg.org>
Subject: [FFmpeg-devel] [PR] avcodec/h264_parser: Check pts for overflow (PR #21755)
Date: Sat, 14 Feb 2026 01:48:50 -0000
Message-ID: <177103373086.25.14231629576594654722@009cbcb3d8cd> (raw)
PR #21755 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21755
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21755.patch
Fixes: signed integer overflow: 9223372036854775807 + 3546086691638400 cannot be represented in type 'int64_t' (aka 'long')
Fixes: 471723681/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-4841032488648704
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>From 85022bb02e39b05599d598545c2d91e102584ccc Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sat, 14 Feb 2026 01:46:48 +0100
Subject: [PATCH] avcodec/h264_parser: Check pts for overflow
Fixes: signed integer overflow: 9223372036854775807 + 3546086691638400 cannot be represented in type 'int64_t' (aka 'long')
Fixes: 471723681/clusterfuzz-testcase-minimized-ffmpeg_dem_MXF_fuzzer-4841032488648704
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/h264_parser.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c
index 040739a1d4..ebf0d8d307 100644
--- a/libavcodec/h264_parser.c
+++ b/libavcodec/h264_parser.c
@@ -650,7 +650,9 @@ static int h264_parse(AVCodecParserContext *s,
}
if (p->reference_dts != AV_NOPTS_VALUE && s->pts == AV_NOPTS_VALUE)
- s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
+ if (av_sat_add64(s->dts, av_rescale(s->pts_dts_delta, num, den)) ==
+ (uint64_t)s->dts + av_rescale(s->pts_dts_delta, num, den))
+ s->pts = s->dts + av_rescale(s->pts_dts_delta, num, den);
if (s->dts_sync_point > 0)
p->reference_dts = s->dts; // new reference
--
2.52.0
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