[PATCH] enclosure: fix oops while iterating enclosure_status array

[Jeff Mahoney <jeffm@jeffreymahoney.com>]

 enclosure_status is expected to be a NULL terminated array of strings
 but isn't actually NULL terminated. When writing an invalid value to
 /sys/class/enclosure/.../.../status, it goes off the end of the array
 and Oopses.

 This patch uses the array size instead.

Reported-by: Artur Wojcik <artur.wojcik@intel.com>
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 drivers/misc/enclosure.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -412,8 +412,9 @@ static ssize_t set_component_status(stru
 	struct enclosure_component *ecomp = to_enclosure_component(cdev);
 	int i;
 
-	for (i = 0; enclosure_status[i]; i++) {
-		if (strncmp(buf, enclosure_status[i],
+	for (i = 0; i < ARRAY_SIZE(enclosure_status); i++) {
+		if (enclosure_status[i] &&
+		    strncmp(buf, enclosure_status[i],
 			    strlen(enclosure_status[i])) == 0 &&
 		    (buf[strlen(enclosure_status[i])] == '\n' ||
 		     buf[strlen(enclosure_status[i])] == '\0'))
-- 
Jeff Mahoney