From 655727381d9f6a8994b3887034e3404d5f6e20fa Mon Sep 17 00:00:00 2001
From: Michael Aherne <michael.aherne@strath.ac.uk>
Date: Thu, 26 Jan 2017 10:45:52 +0000
Subject: [PATCH] MDL-57777 rss: Return 404 when context not found.

---
 rss/file.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/rss/file.php b/rss/file.php
index b0bd7a2b8ec..9a31a11fa34 100644
--- a/rss/file.php
+++ b/rss/file.php
@@ -115,7 +115,11 @@ if ($token === "$inttoken") {
 }
 
 // Check the context actually exists.
-list($context, $course, $cm) = get_context_info_array($contextid);
+try {
+    list($context, $course, $cm) = get_context_info_array($contextid);
+} catch (dml_missing_record_exception $e) {
+    rss_error();
+}
 
 $PAGE->set_context($context);