Merge branch 'smack-for-4.8' of https://github.com/cschaufler/smack-next into next

MAINTAINERS

@@ -10530,7 +10530,7 @@ SMACK SECURITY MODULE
 M:	Casey Schaufler <casey@schaufler-ca.com>
 L:	linux-security-module@vger.kernel.org
 W:	http://schaufler-ca.com
-T:	git git://git.gitorious.org/smack-next/kernel.git
+T:	git git://github.com/cschaufler/smack-next
 S:	Maintained
 F:	Documentation/security/Smack.txt
 F:	security/smack/

security/smack/smack_lsm.c

@@ -2227,6 +2227,9 @@ static int smack_task_kill(struct task_struct *p, struct siginfo *info,
 	struct smack_known *tkp = smk_of_task_struct(p);
 	int rc;
 
+	if (!sig)
+		return 0; /* null signal; existence test */
+
 	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
 	smk_ad_setfield_u_tsk(&ad, p);
 	/*