linux-kernel - [PATCH AUTOSEL 6.6 009/139] wifi: iwlwifi: mvm: drop wrong STA selection in TX

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Message-ID: <20240925121137.1307574-9-sashal@kernel.org>
Date: Wed, 25 Sep 2024 08:07:09 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Johannes Berg <johannes.berg@...el.com>,
	Miri Korenblit <miriam.rachel.korenblit@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	kvalo@...nel.org,
	gregory.greenman@...el.com,
	emmanuel.grumbach@...el.com,
	ilan.peer@...el.com,
	shaul.triebitz@...el.com,
	benjamin.berg@...el.com,
	linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 009/139] wifi: iwlwifi: mvm: drop wrong STA selection in TX

From: Johannes Berg <johannes.berg@...el.com>

[ Upstream commit 1c7e1068a7c9c39ed27636db93e71911e0045419 ]

This shouldn't happen at all, since in station mode all MMPDUs
go through the TXQ for the STA, and not this function. There
may or may not be a race in mac80211 through which this might
happen for some frames while a station is being added, but in
that case we can also just drop the frame and pretend the STA
didn't exist yet.

Also, the code is simply wrong since it uses deflink, and it's
not easy to fix it since the mvmvif->ap_sta pointer cannot be
used without the mutex, and perhaps the right link might not
even be known.

Just drop the frame at that point instead of trying to fix it
up.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@...el.com>
Link: https://patch.msgid.link/20240808232017.45ad105dc7fe.I6d45c82e5758395d9afb8854057ded03c7dc81d7@changeid
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 .../net/wireless/intel/iwlwifi/mvm/mac80211.c    | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index f973efbbc3795..c6264ff10d883 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -766,20 +766,10 @@ void iwl_mvm_mac_tx(struct ieee80211_hw *hw,
 	if (ieee80211_is_mgmt(hdr->frame_control))
 		sta = NULL;
 
-	/* If there is no sta, and it's not offchannel - send through AP */
+	/* this shouldn't even happen: just drop */
 	if (!sta && info->control.vif->type == NL80211_IFTYPE_STATION &&
-	    !offchannel) {
-		struct iwl_mvm_vif *mvmvif =
-			iwl_mvm_vif_from_mac80211(info->control.vif);
-		u8 ap_sta_id = READ_ONCE(mvmvif->deflink.ap_sta_id);
-
-		if (ap_sta_id < mvm->fw->ucode_capa.num_stations) {
-			/* mac80211 holds rcu read lock */
-			sta = rcu_dereference(mvm->fw_id_to_mac_id[ap_sta_id]);
-			if (IS_ERR_OR_NULL(sta))
-				goto drop;
-		}
-	}
+	    !offchannel)
+		goto drop;
 
 	if (tmp_sta && !sta && link_id != IEEE80211_LINK_UNSPECIFIED &&
 	    !ieee80211_is_probe_resp(hdr->frame_control)) {
-- 
2.43.0