fix segfault: unsolicited Paging Response
Do not crash when a Paging Response could not be associated with a VLR
subscriber.
Related: OS#4449
Change-Id: Ie117949dd6da86afaa1a0a6ac57bf2111f6cff43
diff --git a/src/libmsc/paging.c b/src/libmsc/paging.c
index 743ce5c..b288414 100644
--- a/src/libmsc/paging.c
+++ b/src/libmsc/paging.c
@@ -137,6 +137,11 @@
struct paging_request *pr, *pr_next;
struct paging_signal_data sig_data;
+ if (!vsub) {
+ /* A Paging Response has no subscriber. (Related: OS#4449) */
+ return;
+ }
+
osmo_timer_del(&vsub->cs.paging_response_timer);
llist_for_each_entry_safe(pr, pr_next, &vsub->cs.requests, entry) {