[sr-dev] git:master:80beb29a: dialog: safety check for prev field

[Daniel-Constantin Mierla]

Module: kamailio
Branch: master
Commit: 80beb29ac0204697a8964231b441ac37866a4a1c
URL: https://github.com/kamailio/kamailio/commit/80beb29ac0204697a8964231b441ac37866a4a1c

Author: Daniel-Constantin Mierla <miconda at gmail.com>
Committer: Daniel-Constantin Mierla <miconda at gmail.com>
Date: 2021-04-09T17:18:54+02:00

dialog: safety check for prev field

---

Modified: src/modules/dialog/dlg_timer.c

---

Diff:  https://github.com/kamailio/kamailio/commit/80beb29ac0204697a8964231b441ac37866a4a1c.diff
Patch: https://github.com/kamailio/kamailio/commit/80beb29ac0204697a8964231b441ac37866a4a1c.patch

---

diff --git a/src/modules/dialog/dlg_timer.c b/src/modules/dialog/dlg_timer.c
index 0ac13df25c..6b84a4d68c 100644
--- a/src/modules/dialog/dlg_timer.c
+++ b/src/modules/dialog/dlg_timer.c
@@ -222,7 +222,7 @@ static inline struct dlg_tl* get_expired_dlgs(unsigned int time)
 	lock_get( d_timer->lock);
 
 	if (d_timer->first.next==&(d_timer->first)
-	|| d_timer->first.next->timeout > time ) {
+			|| d_timer->first.next->timeout > time ) {
 		lock_release( d_timer->lock);
 		return 0;
 	}
@@ -247,7 +247,9 @@ static inline struct dlg_tl* get_expired_dlgs(unsigned int time)
 		ret = 0;
 	} else {
 		ret = d_timer->first.next;
-		tl->prev->next = 0;
+		if(tl->prev) {
+			tl->prev->next = 0;
+		}
 		d_timer->first.next = tl;
 		tl->prev = &d_timer->first;
 	}