From f78c1375339a291cba492a70eaf12ec501d28a8e Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 14 Feb 2024 20:08:35 +0100
Subject: [PATCH] wifi: nl80211: reject iftype change with mesh ID change
Git-commit: f78c1375339a291cba492a70eaf12ec501d28a8e
Patch-mainline: v6.8-rc7
References: git-fixes
It's currently possible to change the mesh ID when the
interface isn't yet in mesh mode, at the same time as
changing it into mesh mode. This leads to an overwrite
of data in the wdev->u union for the interface type it
currently has, causing cfg80211_change_iface() to do
wrong things when switching.
We could probably allow setting an interface to mesh
while setting the mesh ID at the same time by doing a
different order of operations here, but realistically
there's no userspace that's going to do this, so just
disallow changes in iftype when setting mesh ID.
Cc: stable@vger.kernel.org
Fixes: 29cbe68c516a ("cfg80211/mac80211: add mesh join/leave commands")
Reported-by: syzbot+dd4779978217b1973180@syzkaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
net/wireless/nl80211.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index b09700400d09..bd54a928bab4 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4197,6 +4197,8 @@ static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
if (ntype != NL80211_IFTYPE_MESH_POINT)
return -EINVAL;
+ if (otype != NL80211_IFTYPE_MESH_POINT)
+ return -EINVAL;
if (netif_running(dev))
return -EBUSY;
--
2.35.3