linux-kernel - [PATCH AUTOSEL 4.14 02/10] mac80211_hwsim: initialize ieee80211_tx_info at hw_scan

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Message-Id: <20220223023233.242468-2-sashal@kernel.org>
Date:   Tue, 22 Feb 2022 21:32:25 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     JaeMan Park <jaeman@...gle.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>, johannes@...solutions.net,
        kvalo@...nel.org, davem@...emloft.net, kuba@...nel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 02/10] mac80211_hwsim: initialize ieee80211_tx_info at hw_scan_work

From: JaeMan Park <jaeman@...gle.com>

[ Upstream commit cacfddf82baf1470e5741edeecb187260868f195 ]

In mac80211_hwsim, the probe_req frame is created and sent while
scanning. It is sent with ieee80211_tx_info which is not initialized.
Uninitialized ieee80211_tx_info can cause problems when using
mac80211_hwsim with wmediumd. wmediumd checks the tx_rates field of
ieee80211_tx_info and doesn't relay probe_req frame to other clients
even if it is a broadcasting message.

Call ieee80211_tx_prepare_skb() to initialize ieee80211_tx_info for
the probe_req that is created by hw_scan_work in mac80211_hwsim.

Signed-off-by: JaeMan Park <jaeman@...gle.com>
Link: https://lore.kernel.org/r/20220113060235.546107-1-jaeman@google.com
[fix memory leak]
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mac80211_hwsim.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index b19d19c4be272..ee1eb14ae8fc9 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -2025,6 +2025,15 @@ static void hw_scan_work(struct work_struct *work)
 			if (req->ie_len)
 				skb_put_data(probe, req->ie, req->ie_len);
 
+			if (!ieee80211_tx_prepare_skb(hwsim->hw,
+						      hwsim->hw_scan_vif,
+						      probe,
+						      hwsim->tmp_chan->band,
+						      NULL)) {
+				kfree_skb(probe);
+				continue;
+			}
+
 			local_bh_disable();
 			mac80211_hwsim_tx_frame(hwsim->hw, probe,
 						hwsim->tmp_chan);
-- 
2.34.1