From: Pavel Emelyanov <xemul@openvz.org>
Date: Wed, 23 Apr 2008 07:47:15 +0000 (+0400)
Subject: mac80211: Fix race between ieee80211_rx_bss_put and lookup routines.
X-Git-Tag: v2.6.26-rc1~1088^2~4^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ebebea8e844d01c80b93b8ee4d696ee7c0cbc27;p=pandora-kernel.git

mac80211: Fix race between ieee80211_rx_bss_put and lookup routines.

The put routine first decrements the users counter and then
(if it is zero) locks the sta_bss_lock and removes one from
the list and the hash.

Thus, any of ieee80211_sta_config_auth, ieee80211_rx_bss_get
or ieee80211_rx_mesh_bss_get can race with it by finding a
bss that is about to get kfree-ed.

Using atomic_dec_and_lock in ieee80211_rx_bss_put takes care
of this race.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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