rfkill: copy the name into the rfkill struct

Some users of rfkill, like NFC and cfg80211, use a dynamic name when
allocating rfkill, in those cases dev_name(). Therefore, the pointer
passed to rfkill_alloc() might not be valid forever, I specifically
found the case that the rfkill name was quite obviously an invalid
pointer (or at least garbage) when the wiphy had been renamed.

Fix this by making a copy of the rfkill name in rfkill_alloc().

Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index b41e9ea..f53bf3b6 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -49,7 +49,6 @@
 struct rfkill {
 	spinlock_t		lock;
-	const char		*name;
 	enum rfkill_type	type;
 	unsigned long		state;
@@ -73,6 +72,7 @@
 	struct delayed_work	poll_work;
 	struct work_struct	uevent_work;
 	struct work_struct	sync_work;
+	char			name[];
 #define to_rfkill(d)	container_of(d, struct rfkill, dev)
@@ -876,14 +876,14 @@
 	if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES))
 		return NULL;
-	rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
+	rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL);
 	if (!rfkill)
 		return NULL;
 	rfkill->type = type;
-	rfkill->name = name;
+	strcpy(rfkill->name, name);
 	rfkill->ops = ops;
 	rfkill->data = ops_data;