[PATCH 5.19 0473/1157] wifi: mac80211: reject WEP or pairwise keys with key ID > 3

Greg Kroah-Hartman
2022-08-15T23:54:54Z

From: Johannes Berg <johannes.berg@intel.com>

[ 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@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/mac80211/key.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)

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);
}
--
2.35.1