Fix null pointer dereference in IGMP

virtualsquare · Sep 5, 2023 · 531dc03 · 531dc03
1 parent d7d62fb
commit 531dc03
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/modules/pico_igmp.c b/modules/pico_igmp.c
@@ -367,6 +367,8 @@ static int pico_igmp_timer_is_running(struct igmp_timer *t)
     test.type = t->type;
     test.mcast_link = t->mcast_link;
     test.mcast_group = t->mcast_group;
+    if (!t->stack)
+        return 0;
     timer = pico_tree_findKey(&t->stack->IGMPTimers, &test);
     if (timer)
         return 1;