From 36ba1e80b6711979261c5c24edcfdfe6d6e74009 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Mon, 10 Dec 2018 15:42:04 +0200
Subject: [PATCH] line21dec: Don't read more lines than the height of the frame

---
 ext/closedcaption/gstline21dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/closedcaption/gstline21dec.c b/ext/closedcaption/gstline21dec.c
index ef6451a36a..d5ffbe2fd4 100644
--- a/ext/closedcaption/gstline21dec.c
+++ b/ext/closedcaption/gstline21dec.c
@@ -385,7 +385,7 @@ gst_line_21_decoder_scan (GstLine21Decoder * self, GstVideoFrame * frame)
     i = 0;
   }
 
-  for (; i < self->max_line_probes; i++) {
+  for (; i < self->max_line_probes && i < GST_VIDEO_FRAME_HEIGHT (frame); i++) {
     gint n_lines;
     data = get_video_data (self, frame, i);
     /* Scan until we get n_lines == 2 */