linux-kernel - [PATCH 2.6.32 27/42] rfkill: copy the name into the rfkill struct

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Message-Id: <20160123141223.156768137@1wt.eu>
Date:	Sat, 23 Jan 2016 15:12:48 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Johannes Berg <johannes.berg@...el.com>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 27/42] rfkill: copy the name into the rfkill struct

2.6.32-longterm 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>
(cherry picked from commit 6f23bc6f6be370267332a0278a4646126836baee)
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/rfkill/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index a001f7c..85334a0 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 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)
 
@@ -820,14 +820,14 @@ struct rfkill * __must_check rfkill_alloc(const char *name,
 	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;
 
-- 
1.7.12.2.21.g234cd45.dirty