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From:   Felix Fietkau <nbd@nbd.name>
To:     linux-wireless@vger.kernel.org
Cc:     johannes@sipsolutions.net,
        Brian Coverstone <brian@mainsequence.net>
Subject: [PATCH 3/3] wifi: mac80211: fix invalid drv_sta_pre_rcu_remove calls for non-uploaded sta
Date:   Fri, 24 Mar 2023 13:09:24 +0100
Message-Id: <20230324120924.38412-3-nbd@nbd.name>
In-Reply-To: <20230324120924.38412-1-nbd@nbd.name>
References: <20230324120924.38412-1-nbd@nbd.name>
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Avoid potential data corruption issues caused by uninitialized driver
private data structures.

Reported-by: Brian Coverstone <brian@mainsequence.net>
Fixes: 6a9d1b91f34d ("mac80211: add pre-RCU-sync sta removal driver operation")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/sta_info.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 7d68dbc872d7..941bda9141fa 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1264,7 +1264,8 @@ static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
 	list_del_rcu(&sta->list);
 	sta->removed = true;
 
-	drv_sta_pre_rcu_remove(local, sta->sdata, sta);
+	if (sta->uploaded)
+		drv_sta_pre_rcu_remove(local, sta->sdata, sta);
 
 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 	    rcu_access_pointer(sdata->u.vlan.sta) == sta)
-- 
2.39.0