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mac80211: add missing synchronize_rcu

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commit d2460f4b2fa6dbdeec800414f9cf5b1fc8b71197 upstream.

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>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-01-03 19:42:24 +01:00 committed by Greg Kroah-Hartman
parent 3524a55c69
commit a8767f2c39
1 changed files with 6 additions and 0 deletions
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6
net/mac80211/key.c
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@ -366,6 +366,12 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
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);