AUDIT: Escape comm when logging task info

It comes from the user; it needs to be escaped.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 5fc4f52..b45677e 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -650,7 +650,8 @@
 	struct vm_area_struct *vma;
 
 	get_task_comm(name, current);
-	audit_log_format(ab, " comm=%s", name);
+	audit_log_format(ab, " comm=");
+	audit_log_untrustedstring(ab, name);
 
 	if (!mm)
 		return;