linux-kernel - [PATCH 3.2 05/70] rfkill: copy the name into the rfkill struct

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Date:	Mon, 18 Jan 2016 03:18:35 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Johannes Berg" <johannes.berg@...el.com>
Subject: [PATCH 3.2 05/70] rfkill: copy the name into the rfkill struct

3.2.76-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johannes Berg <johannes.berg@...el.com>

commit b7bb110008607a915298bf0f47d25886ecb94477 upstream.

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().

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/rfkill/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -50,7 +50,6 @@
 struct rfkill {
 	spinlock_t		lock;
 
-	const char		*name;
 	enum rfkill_type	type;
 
 	unsigned long		state;
@@ -74,6 +73,7 @@ struct rfkill {
 	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)
 
@@ -848,14 +848,14 @@ struct rfkill * __must_check rfkill_allo
 	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;
 
 	spin_lock_init(&rfkill->lock);
 	INIT_LIST_HEAD(&rfkill->node);
 	rfkill->type = type;
-	rfkill->name = name;
+	strcpy(rfkill->name, name);
 	rfkill->ops = ops;
 	rfkill->data = ops_data;