Patch "wifi: mac80211: reject WEP or pairwise keys with key ID > 3" has been added to the 5.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    wifi: mac80211: reject WEP or pairwise keys with key ID > 3

to the 5.19-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-reject-wep-or-pairwise-keys-with-key-i.patch
and it can be found in the queue-5.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 8c2c2090a7ccce5417d51f8a8fd461317f2c87c9
Author: Johannes Berg <johannes.berg@xxxxxxxxx>
Date:   Thu May 19 17:57:53 2022 +0200

    wifi: mac80211: reject WEP or pairwise keys with key ID > 3
    
    [ Upstream commit 92ea8df110b8ca92f9664ec7bd76dea109115348 ]
    
    We don't really care too much right now since our data
    structures are set up to not have a problem with this,
    but clearly it's wrong to accept WEP and pairwise keys
    with key ID > 3.
    
    However, with MLD we need to split into per-link (GTK,
    IGTK, BIGTK) and per interface/MLD (including WEP) keys
    so make sure this is not a problem.
    
    Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 0fcf8aebedc4..047a06b857c9 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -433,13 +433,25 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 	int idx;
 	int ret = 0;
 	bool defunikey, defmultikey, defmgmtkey, defbeaconkey;
+	bool is_wep;
 
 	/* caller must provide at least one old/new */
 	if (WARN_ON(!new && !old))
 		return 0;
 
-	if (new)
+	if (new) {
+		idx = new->conf.keyidx;
 		list_add_tail_rcu(&new->list, &sdata->key_list);
+		is_wep = new->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
+			 new->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
+	} else {
+		idx = old->conf.keyidx;
+		is_wep = old->conf.cipher == WLAN_CIPHER_SUITE_WEP40 ||
+			 old->conf.cipher == WLAN_CIPHER_SUITE_WEP104;
+	}
+
+	if ((is_wep || pairwise) && idx >= NUM_DEFAULT_KEYS)
+		return -EINVAL;
 
 	WARN_ON(new && old && new->conf.keyidx != old->conf.keyidx);
 
@@ -451,8 +463,6 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 	}
 
 	if (old) {
-		idx = old->conf.keyidx;
-
 		if (old->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
 			ieee80211_key_disable_hw_accel(old);
 
@@ -460,8 +470,6 @@ static int ieee80211_key_replace(struct ieee80211_sub_if_data *sdata,
 				ret = ieee80211_key_enable_hw_accel(new);
 		}
 	} else {
-		/* new must be provided in case old is not */
-		idx = new->conf.keyidx;
 		if (!new->local->wowlan)
 			ret = ieee80211_key_enable_hw_accel(new);
 	}