[PATCH 4.19 110/195] iwlwifi: dont throw error when trying to remove IGTK

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Luca Coelho <luciano.coelho@intel.com>

commit 197288d5ba8a5289f22d3aeb4fca3824bfd9b4af upstream.

The IGTK keys are only removed by mac80211 after it has already
removed the AP station.  This causes the driver to throw an error
because mac80211 is trying to remove the IGTK when the station doesn't
exist anymore.

The firmware is aware that the station has been removed and can deal
with it the next time we try to add an IGTK for a station, so we
shouldn't try to remove the key if the station ID is
IWL_MVM_INVALID_STA.  Do this by removing the check for mvm_sta before
calling iwl_mvm_send_sta_igtk() and check return from that function
gracefully if the station ID is invalid.

Cc: stable@vger.kernel.org # 4.12+
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -3045,6 +3045,10 @@ static int iwl_mvm_send_sta_igtk(struct
 	igtk_cmd.sta_id = cpu_to_le32(sta_id);
 
 	if (remove_key) {
+		/* This is a valid situation for IGTK */
+		if (sta_id == IWL_MVM_INVALID_STA)
+			return 0;
+
 		igtk_cmd.ctrl_flags |= cpu_to_le32(STA_KEY_NOT_VALID);
 	} else {
 		struct ieee80211_key_seq seq;
@@ -3352,9 +3356,9 @@ int iwl_mvm_remove_sta_key(struct iwl_mv
 	IWL_DEBUG_WEP(mvm, "mvm remove dynamic key: idx=%d sta=%d\n",
 		      keyconf->keyidx, sta_id);
 
-	if (mvm_sta && (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
-			keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
-			keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256))
+	if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
+	    keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
+	    keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256)
 		return iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id, true);
 
 	if (!__test_and_clear_bit(keyconf->hw_key_idx, mvm->fw_key_table)) {