From ef6aab63c900f7fe3d6ee2b00c540a4e54e3b286 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Javier=20Amor=20Garc=C3=ADa?= <jamor@zentyal.com>
Date: Mon, 23 Feb 2015 15:21:16 +0100
Subject: [PATCH] oc-calendar: Don't change event recurrence if parse failed.

get_AppointmentRecurrencePattern() can fail to parse the input data, added a check to avoid setup the recurrence pattern in that case. This should only happen when input data is incorrect.
---
 OpenChange/iCalEvent+MAPIStore.m | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/OpenChange/iCalEvent+MAPIStore.m b/OpenChange/iCalEvent+MAPIStore.m
index 1c94b8ee3..ee1b0d6ec 100644
--- a/OpenChange/iCalEvent+MAPIStore.m
+++ b/OpenChange/iCalEvent+MAPIStore.m
@@ -81,6 +81,12 @@
 
   blob = [mapiRecurrenceData asBinaryInMemCtx: memCtx];
   pattern = get_AppointmentRecurrencePattern (memCtx, blob);
+
+  if (pattern == NULL) {
+    [self logWithFormat: @"Error parsing recurrence pattern. No changes in event recurrence will be done"];
+    return;
+  }
+
   [(iCalCalendar *) parent
     setupRecurrenceWithMasterEntity: self
               fromRecurrencePattern: &pattern->RecurrencePattern];