[FFmpeg-devel] [PATCH 2/8] avformat/mov: reject negative ELST durations

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 2/8] avformat/mov: reject negative ELST durations
Date: Sun, 11 May 2025 02:32:39 +0200
Message-ID: <20250511003245.413345-2-michael@niedermayer.cc> (raw)
In-Reply-To: <20250511003245.413345-1-michael@niedermayer.cc>

Fixes: multiple integer overflows
Fixes: 401016767/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6242067591790592

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 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index cb81b6c4da8..8a094b1ea0a 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -6295,6 +6295,11 @@ static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
                    c->fc->nb_streams-1, i, e->time);
             return AVERROR_INVALIDDATA;
         }
+        if (e->duration < 0) {
+            av_log(c->fc, AV_LOG_ERROR, "Track %d, edit %d: Invalid edit list duration=%"PRId64"\n",
+                   c->fc->nb_streams-1, i, e->duration);
+            return AVERROR_INVALIDDATA;
+        }
     }
     sc->elst_count = i;
 
-- 
2.49.0

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