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[1/2] mac80211_hwsim: fix RCU protected chanctx access

Message ID 20220505230421.fb8055c081a2.Ic6da3307c77a909bd61a0ea25dc2a4b08fe1b03f@changeid (mailing list archive)
State Accepted
Delegated to: Johannes Berg
Headers show
Series [1/2] mac80211_hwsim: fix RCU protected chanctx access | expand

Commit Message

Johannes Berg May 5, 2022, 9:04 p.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

We need to RCU protect the chanctx_conf access, so
do that.

Fixes: 585625c955b1 ("mac80211_hwsim: check TX and STA bandwidth")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 drivers/net/wireless/mac80211_hwsim.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index afdf48550588..4689db129aec 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -2202,11 +2202,14 @@  mac80211_hwsim_sta_rc_update(struct ieee80211_hw *hw,
 	if (!data->use_chanctx) {
 		confbw = data->bw;
 	} else {
-		struct ieee80211_chanctx_conf *chanctx_conf =
-			rcu_dereference(vif->chanctx_conf);
+		struct ieee80211_chanctx_conf *chanctx_conf;
+
+		rcu_read_lock();
+		chanctx_conf = rcu_dereference(vif->chanctx_conf);
 
 		if (!WARN_ON(!chanctx_conf))
 			confbw = chanctx_conf->def.width;
+		rcu_read_unlock();
 	}
 
 	WARN(bw > hwsim_get_chanwidth(confbw),