From 80f857190c7de959543288f36965085b0b31cd6d Mon Sep 17 00:00:00 2001
From: Davide Bertola <dade@dadeb.it>
Date: Thu, 20 Jul 2023 18:47:03 +0200
Subject: [PATCH] mkv: skip invalid seek offset

---
 symphonia-format-mkv/src/demuxer.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/symphonia-format-mkv/src/demuxer.rs b/symphonia-format-mkv/src/demuxer.rs
index ccbc7484..d4fda868 100644
--- a/symphonia-format-mkv/src/demuxer.rs
+++ b/symphonia-format-mkv/src/demuxer.rs
@@ -345,7 +345,14 @@ impl FormatReader for MkvReader {
                             Some((_, etype)) => *etype,
                             None => continue,
                         };
-                        seek_positions.push((etype, segment_pos + element.position));
+                        let destination = match segment_pos.checked_add(element.position) {
+                            Some(pos) => pos,
+                            None => {
+                                log::warn!("seek position overflow for {:?}", etype);
+                                continue;
+                            }
+                        };
+                        seek_positions.push((etype, destination));
                     }
                 }
                 ElementType::Tracks => {