netlabel: Fix a potential NULL pointer dereference

Fix a potential NULL pointer dereference seen when trying to remove a
static label configuration with an invalid address/mask combination.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/netlabel/netlabel_unlabeled.c b/net/netlabel/netlabel_unlabeled.c
index e8a5c32..90c8506 100644 (file)
--- a/net/netlabel/netlabel_unlabeled.c
+++ b/net/netlabel/netlabel_unlabeled.c
@@ -574,9 +574,10 @@ static int netlbl_unlhsh_remove_addr4(struct net *net,
        list_entry = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
                                           &iface->addr4_list);
        spin_unlock(&netlbl_unlhsh_lock);
-       if (list_entry == NULL)
+       if (list_entry != NULL)
+               entry = netlbl_unlhsh_addr4_entry(list_entry);
+       else
                ret_val = -ENOENT;
-       entry = netlbl_unlhsh_addr4_entry(list_entry);
 
        audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
                                              audit_info);
@@ -634,9 +635,10 @@ static int netlbl_unlhsh_remove_addr6(struct net *net,
        spin_lock(&netlbl_unlhsh_lock);
        list_entry = netlbl_af6list_remove(addr, mask, &iface->addr6_list);
        spin_unlock(&netlbl_unlhsh_lock);
-       if (list_entry == NULL)
+       if (list_entry != NULL)
+               entry = netlbl_unlhsh_addr6_entry(list_entry);
+       else
                ret_val = -ENOENT;
-       entry = netlbl_unlhsh_addr6_entry(list_entry);
 
        audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_STCDEL,
                                              audit_info);