From 4c40f73b7002967e824ef34a5435282f4a0ea363 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Wed, 9 Oct 2024 11:23:47 -0400
Subject: [PATCH] subparse: Check for NULL return of strchr() when parsing LRC
 subtitles

Thanks to Antonio Morales for finding and reporting the issue.

Fixes GHSL-2024-263
Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3892

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8039>
---
 subprojects/gst-plugins-base/gst/subparse/gstsubparse.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/subprojects/gst-plugins-base/gst/subparse/gstsubparse.c b/subprojects/gst-plugins-base/gst/subparse/gstsubparse.c
index 8d925524a6..7d286ed318 100644
--- a/subprojects/gst-plugins-base/gst/subparse/gstsubparse.c
+++ b/subprojects/gst-plugins-base/gst/subparse/gstsubparse.c
@@ -1070,6 +1070,11 @@ parse_lrc (ParserState * state, const gchar * line)
     return NULL;
 
   start = strchr (line, ']');
+  // sscanf() does not check for the trailing ] but only up to the last
+  // placeholder, so there might be no ] at the end.
+  if (!start)
+    return NULL;
+
   if (start - line == 9)
     milli = 10;
   else