This is a note to let you know that I've just added the patch titled
cfg80211: call cfg80211_stop_ap when switch from P2P_GO type
to the 5.15-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:
cfg80211-call-cfg80211_stop_ap-when-switch-from-p2p_go-type.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 563fbefed46ae4c1f70cffb8eb54c02df480b2c2 Mon Sep 17 00:00:00 2001
From: Nguyen Dinh Phi <phind.uet@xxxxxxxxx>
Date: Thu, 28 Oct 2021 01:37:22 +0800
Subject: cfg80211: call cfg80211_stop_ap when switch from P2P_GO type
From: Nguyen Dinh Phi <phind.uet@xxxxxxxxx>
commit 563fbefed46ae4c1f70cffb8eb54c02df480b2c2 upstream.
If the userspace tools switch from NL80211_IFTYPE_P2P_GO to
NL80211_IFTYPE_ADHOC via send_msg(NL80211_CMD_SET_INTERFACE), it
does not call the cleanup cfg80211_stop_ap(), this leads to the
initialization of in-use data. For example, this path re-init the
sdata->assigned_chanctx_list while it is still an element of
assigned_vifs list, and makes that linked list corrupt.
Signed-off-by: Nguyen Dinh Phi <phind.uet@xxxxxxxxx>
Reported-by: syzbot+bbf402b783eeb6d908db@xxxxxxxxxxxxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20211027173722.777287-1-phind.uet@xxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: ac800140c20e ("cfg80211: .stop_ap when interface is going down")
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/wireless/util.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1044,6 +1044,7 @@ int cfg80211_change_iface(struct cfg8021
switch (otype) {
case NL80211_IFTYPE_AP:
+ case NL80211_IFTYPE_P2P_GO:
cfg80211_stop_ap(rdev, dev, true);
break;
case NL80211_IFTYPE_ADHOC:
Patches currently in stable-queue which might be from phind.uet@xxxxxxxxx are
queue-5.15/cfg80211-call-cfg80211_stop_ap-when-switch-from-p2p_go-type.patch
