nl80211: fix per-station group key get/del and memory leak

commit 0fa7b39131576dd1baa6ca17fca53c65d7f62249 upstream.

In case userspace attempts to obtain key information for or delete a
unicast key, this is currently erroneously rejected unless the driver
sets the WIPHY_FLAG_IBSS_RSN flag. Apparently enough drivers do so it
was never noticed.

Fix that, and while at it fix a potential memory leak: the error path
in the get_key() function was placed after allocating a message but
didn't free it - move it to a better place. Luckily admin permissions
are needed to call this operation.

Fixes: e31b82136d1ad ("cfg80211/mac80211: allow per-station GTKs")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index cdf77a2..cb4168e 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -1815,6 +1815,9 @@ static int nl80211_get_key(struct sk_buff *skb, struct genl_info *info)
        if (!rdev->ops->get_key)
                return -EOPNOTSUPP;
 
+       if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
+               return -ENOENT;
+
        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
        if (!msg)
                return -ENOMEM;
@@ -1832,10 +1835,6 @@ static int nl80211_get_key(struct sk_buff *skb, struct genl_info *info)
        if (mac_addr)
                NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr);
 
-       if (pairwise && mac_addr &&
-           !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
-               return -ENOENT;
-
        err = rdev->ops->get_key(&rdev->wiphy, dev, key_idx, pairwise,
                                 mac_addr, &cookie, get_key_callback);
 
@@ -2007,7 +2006,7 @@ static int nl80211_del_key(struct sk_buff *skb, struct genl_info *info)
        wdev_lock(dev->ieee80211_ptr);
        err = nl80211_key_allowed(dev->ieee80211_ptr);
 
-       if (key.type == NL80211_KEYTYPE_PAIRWISE && mac_addr &&
+       if (key.type == NL80211_KEYTYPE_GROUP && mac_addr &&
            !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
                err = -ENOENT;