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wifi: nl80211: reject iftype change with mesh ID change

Message ID 20240214200837.64262a35ce9f.I725cb866e9580e48371888c91840e0a955669437@changeid (mailing list archive)
State Accepted
Delegated to: Johannes Berg
Headers show
Series wifi: nl80211: reject iftype change with mesh ID change | expand

Commit Message

Johannes Berg Feb. 14, 2024, 7:08 p.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

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>
---
 net/wireless/nl80211.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

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;