powerpc/xmon: avoid format string leaking to printk

This makes sure format strings cannot leak into printk (the string has
already been correctly processed for format arguments).

Signed-off-by: Kees Cook <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/xmon/nonstdio.c

···
 
 	if (n && rc == 0) {
 		/* No udbg hooks, fallback to printk() - dangerous */
-		printk(xmon_outbuf);
+		printk("%s", xmon_outbuf);
 	}
 }