linux-kernel - [ 29/37] cfg80211: check iface combinations only when iface is running

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Message-Id: <20120717232433.809270914@linuxfoundation.org>
Date:	Tue, 17 Jul 2012 17:03:06 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Michal Kazior <michal.kazior@...to.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [ 29/37] cfg80211: check iface combinations only when iface is running

From: Greg KH <gregkh@...uxfoundation.org>

3.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Michal Kazior <michal.kazior@...to.com>

commit f8cdddb8d61d16a156229f0910f7ecfc7a82c003 upstream.

Don't validate interface combinations on a stopped
interface. Otherwise we might end up being able to
create a new interface with a certain type, but
won't be able to change an existing interface
into that type.

This also skips some other functions when
interface is stopped and changing interface type.

Signed-off-by: Michal Kazior <michal.kazior@...to.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
[Fixes regression introduced by cherry pick of 463454b5dbd8]
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>

---
 net/wireless/util.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -805,7 +805,7 @@ int cfg80211_change_iface(struct cfg8021
 	     ntype == NL80211_IFTYPE_P2P_CLIENT))
 		return -EBUSY;
 
-	if (ntype != otype) {
+	if (ntype != otype && netif_running(dev)) {
 		err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
 						    ntype);
 		if (err)


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