mac80211: fix non RCU-safe sta_list manipulation
sta_info_cleanup locks the sta_list using rcu_read_lock however
the delete operation isn't rcu safe. A race between sta_info_cleanup
timer being called and a STA being removed can occur which leads
to a panic while traversing sta_list. Fix this by switching to the
RCU-safe versions.
Cc: stable@vger.kernel.org
Reported-by: Eyal Shapira <eyal@wizery.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index f5b1638..de455f8 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -378,7 +378,7 @@
/* make the station visible */
sta_info_hash_add(local, sta);
- list_add(&sta->list, &local->sta_list);
+ list_add_rcu(&sta->list, &local->sta_list);
set_sta_flag(sta, WLAN_STA_INSERTED);
@@ -688,7 +688,7 @@
if (ret)
return ret;
- list_del(&sta->list);
+ list_del_rcu(&sta->list);
mutex_lock(&local->key_mtx);
for (i = 0; i < NUM_DEFAULT_KEYS; i++)