This is a note to let you know that I've just added the patch titled
mac80211: fix non RCU-safe sta_list manipulation
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mac80211-fix-non-rcu-safe-sta_list-manipulation.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 794454ce72a298de6f4536ade597bdcc7dcde7c7 Mon Sep 17 00:00:00 2001
From: Arik Nemtsov <a...@wizery.com>
Date: Sun, 3 Jun 2012 23:32:32 +0300
Subject: mac80211: fix non RCU-safe sta_list manipulation
From: Arik Nemtsov <a...@wizery.com>
commit 794454ce72a298de6f4536ade597bdcc7dcde7c7 upstream.
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.
Reported-by: Eyal Shapira <e...@wizery.com>
Signed-off-by: Arik Nemtsov <a...@wizery.com>
Signed-off-by: John W. Linville <linvi...@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
net/mac80211/sta_info.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -378,7 +378,7 @@ static int sta_info_insert_finish(struct
/* 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 @@ int __must_check __sta_info_destroy(stru
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++)
Patches currently in stable-queue which might be from a...@wizery.com are
queue-3.4/mac80211-fix-non-rcu-safe-sta_list-manipulation.patch
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