This is a note to let you know that I've just added the patch titled
wifi: mac80211: fix invalid drv_sta_pre_rcu_remove calls for non-uploaded sta
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-mac80211-fix-invalid-drv_sta_pre_rcu_remove-cal.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f25e0729c42a07d11b6392704dd231aa3d5d6ae3
Author: Felix Fietkau <nbd@xxxxxxxx>
Date: Fri Mar 24 13:09:24 2023 +0100
wifi: mac80211: fix invalid drv_sta_pre_rcu_remove calls for non-uploaded sta
[ Upstream commit 12b220a6171faf10638ab683a975cadcf1a352d6 ]
Avoid potential data corruption issues caused by uninitialized driver
private data structures.
Reported-by: Brian Coverstone <brian@xxxxxxxxxxxxxxxx>
Fixes: 6a9d1b91f34d ("mac80211: add pre-RCU-sync sta removal driver operation")
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Link: https://lore.kernel.org/r/20230324120924.38412-3-nbd@xxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 4d6890250337d..0f97c6fcec174 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1023,7 +1023,8 @@ 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)
