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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/ipv4/devinet.c
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@@ -351,14 +351,14 @@
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 {
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 	struct in_ifaddr *promote = NULL;
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 	struct in_ifaddr *ifa, *ifa1;
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-	struct in_ifaddr *last_prim;
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+	struct in_ifaddr __rcu **last_prim;
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 	struct in_ifaddr *prev_prom = NULL;
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 	int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
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 	ASSERT_RTNL();
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 	ifa1 = rtnl_dereference(*ifap);
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-	last_prim = rtnl_dereference(in_dev->ifa_list);
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+	last_prim = ifap;
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 	if (in_dev->dead)
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 		goto no_promotions;
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..
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@@ -372,7 +372,7 @@
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 		while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
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 			if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
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 			    ifa1->ifa_scope <= ifa->ifa_scope)
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-				last_prim = ifa;
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+				last_prim = &ifa->ifa_next;
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 			if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
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 			    ifa1->ifa_mask != ifa->ifa_mask ||
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@@ -436,9 +436,9 @@
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 			rcu_assign_pointer(prev_prom->ifa_next, next_sec);
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-			last_sec = rtnl_dereference(last_prim->ifa_next);
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+			last_sec = rtnl_dereference(*last_prim);
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 			rcu_assign_pointer(promote->ifa_next, last_sec);
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-			rcu_assign_pointer(last_prim->ifa_next, promote);
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+			rcu_assign_pointer(*last_prim, promote);
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 		}
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 		promote->ifa_flags &= ~IFA_F_SECONDARY;