linux-kernel - [PATCH 4.19 121/361] iwlwifi: mvm: fix BAR seq ctrl reporting

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 11 Nov 2018 14:17:48 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sara Sharon <sara.sharon@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 121/361] iwlwifi: mvm: fix BAR seq ctrl reporting

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

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

From: Sara Sharon <sara.sharon@...el.com>

[ Upstream commit 941ab4eb66c10bc5c7234e83a7a858b2806ed151 ]

There is a bug in FW where the sequence control may be
incorrect, and the driver overrides it with the value
of the ieee80211 header.

However, in BAR there is no sequence control in the header,
which result with arbitrary sequence.

This access to an unknown location is bad and it makes the
logs very confusing - so fix it.

Signed-off-by: Sara Sharon <sara.sharon@...el.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/tx.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
@@ -1405,6 +1405,7 @@ static void iwl_mvm_rx_tx_cmd_single(str
 	while (!skb_queue_empty(&skbs)) {
 		struct sk_buff *skb = __skb_dequeue(&skbs);
 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+		struct ieee80211_hdr *hdr = (void *)skb->data;
 		bool flushed = false;
 
 		skb_freed++;
@@ -1449,11 +1450,11 @@ static void iwl_mvm_rx_tx_cmd_single(str
 			info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 
-		/* W/A FW bug: seq_ctl is wrong when the status isn't success */
-		if (status != TX_STATUS_SUCCESS) {
-			struct ieee80211_hdr *hdr = (void *)skb->data;
+		/* W/A FW bug: seq_ctl is wrong upon failure / BAR frame */
+		if (ieee80211_is_back_req(hdr->frame_control))
+			seq_ctl = 0;
+		else if (status != TX_STATUS_SUCCESS)
 			seq_ctl = le16_to_cpu(hdr->seq_ctrl);
-		}
 
 		if (unlikely(!seq_ctl)) {
 			struct ieee80211_hdr *hdr = (void *)skb->data;