package/kernel/mac80211/patches/subsys/358-wifi-mac80211-fix-crash-in-beacon-protection-for-P2P.patch

   1 From: Johannes Berg <johannes.berg@intel.com>
   2 Date: Wed, 5 Oct 2022 21:24:10 +0200
   3 Subject: [PATCH] wifi: mac80211: fix crash in beacon protection for
   4  P2P-device
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 commit b2d03cabe2b2e150ff5a381731ea0355459be09f upstream.
  10
  11 If beacon protection is active but the beacon cannot be
  12 decrypted or is otherwise malformed, we call the cfg80211
  13 API to report this to userspace, but that uses a netdev
  14 pointer, which isn't present for P2P-Device. Fix this to
  15 call it only conditionally to ensure cfg80211 won't crash
  16 in the case of P2P-Device.
  17
  18 This fixes CVE-2022-42722.
  19
  20 Reported-by: Sönke Huster <shuster@seemoo.tu-darmstadt.de>
  21 Fixes: 9eaf183af741 ("mac80211: Report beacon protection failures to user space")
  22 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  23 ---
  24
  25 --- a/net/mac80211/rx.c
  26 +++ b/net/mac80211/rx.c
  27 @@ -1986,10 +1986,11 @@ ieee80211_rx_h_decrypt(struct ieee80211_
  28
  29                 if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
  30                     mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
  31 -                   NUM_DEFAULT_BEACON_KEYS) {
  32 -                       cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
  33 -                                                    skb->data,
  34 -                                                    skb->len);
  35 +                                  NUM_DEFAULT_BEACON_KEYS) {
  36 +                       if (rx->sdata->dev)
  37 +                               cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
  38 +                                                            skb->data,
  39 +                                                            skb->len);
  40                         return RX_DROP_MONITOR; /* unexpected BIP keyidx */
  41                 }
  42
  43 @@ -2137,7 +2138,8 @@ ieee80211_rx_h_decrypt(struct ieee80211_
  44         /* either the frame has been decrypted or will be dropped */
  45         status->flag |= RX_FLAG_DECRYPTED;
  46
  47 -       if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE))
  48 +       if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE &&
  49 +                    rx->sdata->dev))
  50                 cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
  51                                              skb->data, skb->len);
  52