[PATCH 1/1] mac80211: fix an oops in several failure paths in key allocation

[Tomas Winkler <tomas.winkler@intel.com>]

From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

This patch fixes an oops in several failure paths in key allocation. This
Oops occurs when freeing a key that has not been linked yet, so the
key->sdata is not set.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 net/mac80211/key.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index d4893bd..6597c77 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -387,6 +387,15 @@ void ieee80211_key_free(struct ieee80211_key *key)
 	if (!key)
 		return;
 
+	if (!key->sdata) {
+		/* The key has not been linked yet, simply free it
+		 * and don't Oops */
+		if (key->conf.alg == ALG_CCMP)
+			ieee80211_aes_key_free(key->u.ccmp.tfm);
+		kfree(key);
+		return;
+	}
+
 	spin_lock_irqsave(&key->sdata->local->key_lock, flags);
 	__ieee80211_key_free(key);
 	spin_unlock_irqrestore(&key->sdata->local->key_lock, flags);
-- 
1.5.4.1

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