[PATCH AUTOSEL for 4.4 008/167] mac80211: bail out from prep_connection() if a reconfig is ongoing

Sasha Levin
2018-03-19T17:35:52Z

From: Luca Coelho <luciano.coelho@intel.com>

[ 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>
---
net/mac80211/mlme.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 23095d5e0199..005cd8796505 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -4326,6 +4326,10 @@ 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);
--
2.14.1