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@xxxxxxxxxxxxxxxx> --- 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) -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
