Avoid null-pointer dereference wen a device tree refers to a pin-function

that doesn't exist.

diff --git a/sys/dev/fdt/sxipio.c b/sys/dev/fdt/sxipio.c
index 7e113ed..2298baf 100644 (file)
--- a/sys/dev/fdt/sxipio.c
+++ b/sys/dev/fdt/sxipio.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: sxipio.c,v 1.5 2017/11/13 09:24:59 kettenis Exp $     */
+/*     $OpenBSD: sxipio.c,v 1.6 2017/12/23 12:28:45 kettenis Exp $     */
 /*
  * Copyright (c) 2010 Miodrag Vallat.
  * Copyright (c) 2013 Artturi Alm
@@ -292,6 +292,8 @@ sxipio_pinctrl(uint32_t phandle, void *cookie)
 
                /* Lookup the function of the pin. */
                for (j = 0; j < nitems(sc->sc_pins[i].funcs); j++) {
+                       if (sc->sc_pins[i].funcs[j].name == NULL)
+                               continue;
                        if (strcmp(func, sc->sc_pins[i].funcs[j].name) == 0)
                                break;
                }