[PATCH] mac80211: fix possible NULL pointer dereference

[Mariusz Kozlowski]

This patch moves 'key' dereference after BUG_ON(!key) so that when key is NULL
we will see proper trace instead of oops.

Signed-off-by: Mariusz Kozlowski <mk@xxxxxxxxxxxx>
---
 net/mac80211/key.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 8c02469..fd97925 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -400,11 +400,12 @@ int ieee80211_key_link(struct ieee80211_key *key,
 {
 	struct ieee80211_key *old_key;
 	int idx, ret;
-	bool pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
+	bool pairwise;
 
 	BUG_ON(!sdata);
 	BUG_ON(!key);
 
+	pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
 	idx = key->conf.keyidx;
 	key->local = sdata->local;
 	key->sdata = sdata;
-- 
1.7.0.4

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