[PATCH 5.4 08/43] mac80211_hwsim: call ieee80211_tx_prepare_skb under RCU protection

Greg Kroah-Hartman
2022-05-16T19:47:55Z

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

[ Upstream commit 9e2db50f1ef2238fc2f71c5de1c0418b7a5b0ea2 ]

This is needed since it might use (and pass out) pointers to
e.g. keys protected by RCU. Can't really happen here as the
frames aren't encrypted, but we need to still adhere to the
rules.

Fixes: cacfddf82baf ("mac80211_hwsim: initialize ieee80211_tx_info at hw_scan_work")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20220505230421.5f139f9de173.I77ae111a28f7c0e9fd1ebcee7f39dbec5c606770@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/mac80211_hwsim.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 6e1721d53384..ffe27104f654 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -2062,11 +2062,13 @@ static void hw_scan_work(struct work_struct *work)
if (req->ie_len)
skb_put_data(probe, req->ie, req->ie_len);

+ rcu_read_lock();
if (!ieee80211_tx_prepare_skb(hwsim->hw,
hwsim->hw_scan_vif,
probe,
hwsim->tmp_chan->band,
NULL)) {
+ rcu_read_unlock();
kfree_skb(probe);
continue;
}
@@ -2074,6 +2076,7 @@ static void hw_scan_work(struct work_struct *work)
local_bh_disable();
mac80211_hwsim_tx_frame(hwsim->hw, probe,
hwsim->tmp_chan);
+ rcu_read_unlock();
local_bh_enable();
}
}
--
2.35.1