[PATCH 02/10] iwlwifi: mvm: Avoid accessing Null pointer when setting igtk

[Emmanuel Grumbach <emmanuel.grumbach@intel.com>]

From: Matti Gottlieb <matti.gottlieb@intel.com>

Sometimes when setting an igtk key the station maybe NULL.
In the of case igtk the function will skip to the end, and
try to print sta->addr, if sta is Null - we will access a
Null pointer.

Avoid accessing a Null pointer when setting a igtk key &
the sta == NULL, and print a default MAC address instead.

Signed-off-by: Matti Gottlieb <matti.gottlieb@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
---
 drivers/net/wireless/iwlwifi/mvm/sta.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/iwlwifi/mvm/sta.c b/drivers/net/wireless/iwlwifi/mvm/sta.c
index d68dc69..26f076e 100644
--- a/drivers/net/wireless/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/iwlwifi/mvm/sta.c
@@ -1401,6 +1401,7 @@ int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
 	bool mcast = !(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE);
 	u8 sta_id;
 	int ret;
+	static const u8 __maybe_unused zero_addr[ETH_ALEN] = {0};
 
 	lockdep_assert_held(&mvm->mutex);
 
@@ -1467,7 +1468,7 @@ int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
 end:
 	IWL_DEBUG_WEP(mvm, "key: cipher=%x len=%d idx=%d sta=%pM ret=%d\n",
 		      keyconf->cipher, keyconf->keylen, keyconf->keyidx,
-		      sta->addr, ret);
+		      sta ? sta->addr : zero_addr, ret);
 	return ret;
 }
 
-- 
2.1.4