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mac80211: fix a race condition during key deletion

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24895 3c298f89-4303-0410-b956-a3cf2f4a3e73
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nbd 2011-01-04 00:37:28 +00:00
parent 3e84836591
commit cbe34afecd
1 changed files with 32 additions and 0 deletions
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package/mac80211/patches/320-mac80211_fix_key_del_race.patch Normal file
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@ -0,0 +1,32 @@
From: Johannes Berg <johannes.berg@intel.com>
commit ad0e2b5a00dbec303e4682b403bb6703d11dcdb2
Author: Johannes Berg <johannes.berg@intel.com>
Date: Tue Jun 1 10:19:19 2010 +0200
mac80211: simplify key locking
removed the synchronization against RCU and thus
opened a race window where we can use a key for
TX while it is already freed. Put a synchronisation
into the right place to close that window.
Reported-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Cc: stable@kernel.org [2.6.36+]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -382,6 +382,12 @@ static void __ieee80211_key_destroy(stru
if (!key)
return;
+ /*
+ * Synchronize so the TX path can no longer be using
+ * this key before we free/remove it.
+ */
+ synchronize_rcu();
+
if (key->local)
ieee80211_key_disable_hw_accel(key);