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mac80211: fix invalid calls to drv_sta_pre_rcu_remove

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Potentially fixes some driver data structure corruption issues

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 9779ee021d)
[Change patch number]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
This commit is contained in:
Felix Fietkau 2023-03-24 13:32:36 +01:00 committed by Hauke Mehrtens
parent fc1750b305
commit 6035401f46
1 changed files with 25 additions and 0 deletions
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package/kernel/mac80211/patches/subsys/352-wifi-mac80211-fix-invalid-drv_sta_pre_rcu_remove-cal.patch Normal file
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From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 24 Mar 2023 13:04:17 +0100
Subject: [PATCH] wifi: mac80211: fix invalid drv_sta_pre_rcu_remove calls for
non-uploaded sta
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>
---
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1041,7 +1041,8 @@ static int __must_check __sta_info_destr
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)