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UPSTREAM: wifi: mac80211: fix crash in beacon protection for P2P-device

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commit b2d03cabe2b2e150ff5a381731ea0355459be09f upstream.

If beacon protection is active but the beacon cannot be
decrypted or is otherwise malformed, we call the cfg80211
API to report this to userspace, but that uses a netdev
pointer, which isn't present for P2P-Device. Fix this to
call it only conditionally to ensure cfg80211 won't crash
in the case of P2P-Device.

This fixes CVE-2022-42722.

Bug: 253642089
Reported-by: Sönke Huster <shuster@seemoo.tu-darmstadt.de>
Fixes: 9eaf183af7 ("mac80211: Report beacon protection failures to user space")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Iaf78191f71e4cae975204870fe78f90ba50d4245
This commit is contained in:
Johannes Berg
2022-10-05 21:24:10 +02:00
committed by Lee Jones
parent b2126d0131
commit db5865ed3c
1 changed files with 7 additions and 5 deletions
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12
net/mac80211/rx.c
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@@ -1983,10 +1983,11 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
NUM_DEFAULT_BEACON_KEYS) {
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
skb->data,
skb->len);
NUM_DEFAULT_BEACON_KEYS) {
if (rx->sdata->dev)
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
skb->data,
skb->len);
return RX_DROP_MONITOR; /* unexpected BIP keyidx */
}
@@ -2134,7 +2135,8 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
/* either the frame has been decrypted or will be dropped */
status->flag |= RX_FLAG_DECRYPTED;
if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE))
if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE &&
rx->sdata->dev))
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
skb->data, skb->len);