From: Johannes Berg <johannes@sipsolutions.net>
To: John Linville <linville@tuxdriver.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>
Subject: [PATCH] cfg80211: fix race in giwrate
Date: Tue, 07 Jul 2009 23:41:27 +0200 [thread overview]
Message-ID: <1247002887.4755.48.camel@johannes.local> (raw)
cfg80211_wext_giwrate doesn't lock the wdev, so it
cannot access current_bss race-free. Also, there's
little point in trying to ask the driver for an AP
that it never told us about, so avoid that case.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
---
net/wireless/wext-compat.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
--- wireless-testing.orig/net/wireless/wext-compat.c 2009-07-07 23:39:01.000000000 +0200
+++ wireless-testing/net/wireless/wext-compat.c 2009-07-07 23:39:11.000000000 +0200
@@ -1127,7 +1127,7 @@ int cfg80211_wext_giwrate(struct net_dev
struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
/* we are under RTNL - globally locked - so can use a static struct */
static struct station_info sinfo;
- u8 *addr;
+ u8 addr[ETH_ALEN];
int err;
if (wdev->iftype != NL80211_IFTYPE_STATION)
@@ -1136,12 +1136,15 @@ int cfg80211_wext_giwrate(struct net_dev
if (!rdev->ops->get_station)
return -EOPNOTSUPP;
+ err = 0;
+ wdev_lock(wdev);
if (wdev->current_bss)
- addr = wdev->current_bss->pub.bssid;
- else if (wdev->wext.connect.bssid)
- addr = wdev->wext.connect.bssid;
+ memcpy(addr, wdev->current_bss->pub.bssid, ETH_ALEN);
else
- return -EOPNOTSUPP;
+ err = -EOPNOTSUPP;
+ wdev_unlock(wdev);
+ if (err)
+ return err;
err = rdev->ops->get_station(&rdev->wiphy, dev, addr, &sinfo);
if (err)
reply other threads:[~2009-07-07 21:42 UTC|newest]
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