[PATCH 3.13.y-ckt 37/80] nl80211: fix per-station group key get/del and memory leak

From: Kamal Mostafa
Date: Thu Mar 19 2015 - 18:51:35 EST

3.13.11-ckt17 -stable review patch. If anyone has any objections, please let me know.


From: Johannes Berg <johannes.berg@xxxxxxxxx>

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@xxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
net/wireless/nl80211.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 16616f1..30caa5c 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -2681,6 +2681,9 @@ static int nl80211_get_key(struct sk_buff *skb, struct genl_info *info)
if (!rdev->ops->get_key)

+ if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
+ return -ENOENT;
if (!msg)
return -ENOMEM;
@@ -2700,10 +2703,6 @@ static int nl80211_get_key(struct sk_buff *skb, struct genl_info *info)
nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr))
goto nla_put_failure;

- if (pairwise && mac_addr &&
- !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
- return -ENOENT;
err = rdev_get_key(rdev, dev, key_idx, pairwise, mac_addr, &cookie,

@@ -2874,7 +2873,7 @@ static int nl80211_del_key(struct sk_buff *skb, struct genl_info *info)
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;


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