Revert "selinux: fix the default socket labeling in sock_graft()"

This reverts commit 4da6daf4d3df5a977e4623963f141a627fd2efce.

Unfortunately, the commit in question caused problems with Bluetooth
devices, specifically it caused them to get caught in the newly
created BUG_ON() check.  The AF_ALG problem still exists, but will be
addressed in a future patch.

Cc: stable@vger.kernel.org
Signed-off-by: Paul Moore <pmoore@redhat.com>

include/linux/security.h

@@ -987,10 +987,7 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *	Retrieve the LSM-specific secid for the sock to enable caching of network
  *	authorizations.
  * @sock_graft:
- *	This hook is called in response to a newly created sock struct being
- *	grafted onto an existing socket and allows the security module to
- *	perform whatever security attribute management is necessary for both
- *	the sock and socket.
+ *	Sets the socket's isec sid to the sock's sid.
  * @inet_conn_request:
  *	Sets the openreq's sid to socket's sid with MLS portion taken from peer sid.
  * @inet_csk_clone:

security/selinux/hooks.c

@@ -4499,18 +4499,9 @@ static void selinux_sock_graft(struct sock *sk, struct socket *parent)
 	struct inode_security_struct *isec = SOCK_INODE(parent)->i_security;
 	struct sk_security_struct *sksec = sk->sk_security;
 
-	switch (sk->sk_family) {
-	case PF_INET:
-	case PF_INET6:
-	case PF_UNIX:
+	if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
+	    sk->sk_family == PF_UNIX)
 		isec->sid = sksec->sid;
-		break;
-	default:
-		/* by default there is no special labeling mechanism for the
-		 * sksec label so inherit the label from the parent socket */
-		BUG_ON(sksec->sid != SECINITSID_UNLABELED);
-		sksec->sid = isec->sid;
-	}
 	sksec->sclass = isec->sclass;
 }