bonding: fix NULL pointer deref in startup processing

	Fix the "are we creating a duplicate" check to not compare
the name if the name is NULL (meaning that the system should select
a name).  Bug reported by Benny Amorsen <benny+usenet@amorsen.dk>.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 65c7ebafaacd..81b45740ed77 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4896,14 +4896,16 @@ int bond_create(char *name, struct bond_params *params, struct bonding **newbond
         down_write(&bonding_rwsem);
 
         /* Check to see if the bond already exists. */
-        list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
-                if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
-                        printk(KERN_ERR DRV_NAME
+        if (name) {
+                list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
+                        if (strnicmp(bond->dev->name, name, IFNAMSIZ) == 0) {
+                                printk(KERN_ERR DRV_NAME
                                ": cannot add bond %s; it already exists\n",
-                               name);
-                        res = -EPERM;
-                        goto out_rtnl;
-                }
+                                       name);
+                                res = -EPERM;
+                                goto out_rtnl;
+                        }
+        }
 
         bond_dev = alloc_netdev(sizeof(struct bonding), name ? name : "",
                                 ether_setup);