linux-kernel - [PATCH 4.14 255/496] iwlwifi: mvm: Correctly set IGTK for AP

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Date:   Mon, 28 May 2018 12:00:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Beni Lev <beni.lev@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 255/496] iwlwifi: mvm: Correctly set IGTK for AP

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Beni Lev <beni.lev@...el.com>

[ Upstream commit e829b17caf96c2da34620e335fb777592990906c ]

Currently when an IGTK is set for an AP, it is set as a regular key.
Since the cipher is set to CMAC, the STA_KEY_FLG_EXT flag is added to
the host command, which causes assert 0x253D on NICs that do not support
this.

Fixes: 85aeb58cec1a ("iwlwifi: mvm: Enable security on new TX API")
Signed-off-by: Beni Lev <beni.lev@...el.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/sta.c |   21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.c
@@ -3182,17 +3182,9 @@ int iwl_mvm_set_sta_key(struct iwl_mvm *
 		}
 		sta_id = mvm_sta->sta_id;
 
-		if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
-		    keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
-		    keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256) {
-			ret = iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id,
-						    false);
-			goto end;
-		}
-
 		/*
 		 * It is possible that the 'sta' parameter is NULL, and thus
-		 * there is a need to retrieve  the sta from the local station
+		 * there is a need to retrieve the sta from the local station
 		 * table.
 		 */
 		if (!sta) {
@@ -3207,6 +3199,17 @@ int iwl_mvm_set_sta_key(struct iwl_mvm *
 
 		if (WARN_ON_ONCE(iwl_mvm_sta_from_mac80211(sta)->vif != vif))
 			return -EINVAL;
+	} else {
+		struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+
+		sta_id = mvmvif->mcast_sta.sta_id;
+	}
+
+	if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
+	    keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
+	    keyconf->cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256) {
+		ret = iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id, false);
+		goto end;
 	}
 
 	/* If the key_offset is not pre-assigned, we need to find a