netlabel: Always remove the correct address selector

The NetLabel address selector mechanism has a problem where it can get
mistakenly remove the wrong selector when similar addresses are used.  The
problem is caused when multiple addresses are configured that have different
netmasks but the same address, e.g. 127.0.0.0/8 and 127.0.0.0/24.  This patch
fixes the problem.
Reported-by: NEtienne Basset <etienne.basset@numericable.fr>
Signed-off-by: NPaul Moore <paul.moore@hp.com>
Acked-by: NJames Morris <jmorris@namei.org>
Tested-by: NEtienne Basset <etienne.basset@numericable.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/netlabel/netlabel_addrlist.c

@@ -256,13 +256,11 @@ struct netlbl_af4list *netlbl_af4list_remove(__be32 addr, __be32 mask,
 {
 	struct netlbl_af4list *entry;
 
-	entry = netlbl_af4list_search(addr, head);
-	if (entry != NULL && entry->addr == addr && entry->mask == mask) {
-		netlbl_af4list_remove_entry(entry);
-		return entry;
-	}
-
-	return NULL;
+	entry = netlbl_af4list_search_exact(addr, mask, head);
+	if (entry == NULL)
+		return NULL;
+	netlbl_af4list_remove_entry(entry);
+	return entry;
 }
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
@@ -299,15 +297,11 @@ struct netlbl_af6list *netlbl_af6list_remove(const struct in6_addr *addr,
 {
 	struct netlbl_af6list *entry;
 
-	entry = netlbl_af6list_search(addr, head);
-	if (entry != NULL &&
-	    ipv6_addr_equal(&entry->addr, addr) &&
-	    ipv6_addr_equal(&entry->mask, mask)) {
-		netlbl_af6list_remove_entry(entry);
-		return entry;
-	}
-
-	return NULL;
+	entry = netlbl_af6list_search_exact(addr, mask, head);
+	if (entry == NULL)
+		return NULL;
+	netlbl_af6list_remove_entry(entry);
+	return entry;
 }
 #endif /* IPv6 */