diff options
| author | Dmitry Ivanov <dmitrijs.ivanovs@ubnt.com> | 2016-04-06 17:23:18 +0300 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-05-08 08:08:59 -0400 |
| commit | 2c8c83f64c0fb9764b486f14a08f2e3e51bcbc40 (patch) | |
| tree | eaf61c7b3d01de0dadb38efd71926315c7368185 /net | |
| parent | 3254e46ceac3033a4f7b433d36e54da714a05bd8 (diff) | |
nl80211: check netlink protocol in socket release notification
[ Upstream commit 8f815cdde3e550e10c2736990d791f60c2ce43eb ]
A non-privileged user can create a netlink socket with the same port_id as
used by an existing open nl80211 netlink socket (e.g. as used by a hostapd
process) with a different protocol number.
Closing this socket will then lead to the notification going to nl80211's
socket release notification handler, and possibly cause an action such as
removing a virtual interface.
Fix this issue by checking that the netlink protocol is NETLINK_GENERIC.
Since generic netlink has no notifier chain of its own, we can't fix the
problem more generically.
Fixes: 026331c4d9b5 ("cfg80211/mac80211: allow registering for and sending action frames")
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Ivanov <dima@ubnt.com>
[rewrite commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/wireless/nl80211.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 04b6f3f6ee0b..f24138681b80 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -12777,7 +12777,7 @@ static int nl80211_netlink_notify(struct notifier_block * nb, struct wireless_dev *wdev; struct cfg80211_beacon_registration *reg, *tmp; - if (state != NETLINK_URELEASE) + if (state != NETLINK_URELEASE || notify->protocol != NETLINK_GENERIC) return NOTIFY_DONE; rcu_read_lock(); |