mac80211: bail out from prep_connection() if a reconfig is ongoing

[ Upstream commit f8860ce836f2d502b07ef99559707fe55d90f5bc ]

If ieee80211_hw_restart() is called during authentication, the
authentication process will continue, causing the driver to be called
in a wrong state.  This ultimately causes an oops in the iwlwifi
driver (at least).

This fixes bugzilla 195299 partly.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=195299
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index fdab4f1..e6f42d1 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -4332,6 +4332,10 @@ static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
        if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
                return -EINVAL;
 
+       /* If a reconfig is happening, bail out */
+       if (local->in_reconfig)
+               return -EBUSY;
+
        if (assoc) {
                rcu_read_lock();
                have_sta = sta_info_get(sdata, cbss->bssid);