From aae9d5c0e9a1981e4a2ce558eb5dada305d01a9a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Tue, 17 Sep 2024 11:59:36 +0300
Subject: [PATCH] closedcaption: cea608utils: Avoid overflow when deciding
 which lines to retain

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1776>
---
 video/closedcaption/src/cea608utils.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/video/closedcaption/src/cea608utils.rs b/video/closedcaption/src/cea608utils.rs
index 9e714f4d..e8f3ad6f 100644
--- a/video/closedcaption/src/cea608utils.rs
+++ b/video/closedcaption/src/cea608utils.rs
@@ -373,7 +373,7 @@ impl Cea608Frame {
         }
         let n_rows = self.mode.unwrap().rollup_rows().unwrap();
         self.display_lines
-            .retain(|line| line.no > (self.base_row - n_rows + 1) as usize);
+            .retain(|line| line.no > self.base_row as usize + 1 - n_rows as usize);
         for line in self.display_lines.iter_mut() {
             line.no -= 1;
         }