appletalk: Fix potential NULL pointer dereference in unregister_snap_client

[uclinux-h8/linux.git] / net / appletalk / ddp.c

diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 795fbc6..709d254 100644 (file)
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1904,9 +1904,6 @@ static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
 EXPORT_SYMBOL(atrtr_get_dev);
 EXPORT_SYMBOL(atalk_find_dev_addr);
 
-static const char atalk_err_snap[] __initconst =
-       KERN_CRIT "Unable to register DDP with SNAP.\n";
-
 /* Called by proto.c on kernel start up */
 static int __init atalk_init(void)
 {
@@ -1921,17 +1918,22 @@ static int __init atalk_init(void)
                goto out_proto;
 
        ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
-       if (!ddp_dl)
-               printk(atalk_err_snap);
+       if (!ddp_dl) {
+               pr_crit("Unable to register DDP with SNAP.\n");
+               goto out_sock;
+       }
 
        dev_add_pack(&ltalk_packet_type);
        dev_add_pack(&ppptalk_packet_type);
 
        rc = register_netdevice_notifier(&ddp_notifier);
        if (rc)
-               goto out_sock;
+               goto out_snap;
+
+       rc = aarp_proto_init();
+       if (rc)
+               goto out_dev;
 
-       aarp_proto_init();
        rc = atalk_proc_init();
        if (rc)
                goto out_aarp;
@@ -1945,11 +1947,13 @@ out_proc:
        atalk_proc_exit();
 out_aarp:
        aarp_cleanup_module();
+out_dev:
        unregister_netdevice_notifier(&ddp_notifier);
-out_sock:
+out_snap:
        dev_remove_pack(&ppptalk_packet_type);
        dev_remove_pack(&ltalk_packet_type);
        unregister_snap_client(ddp_dl);
+out_sock:
        sock_unregister(PF_APPLETALK);
 out_proto:
        proto_unregister(&ddp_proto);