wifi: iwlwifi: mvm: fix a crash when we run out of stations

commit b7198383ef2debe748118996f627452281cf27d7 upstream.

A DoS tool that injects loads of authentication frames made our AP
crash. The iwl_mvm_is_dup() function couldn't find the per-queue
dup_data which was not allocated.

The root cause for that is that we ran out of stations in the firmware
and we didn't really add the station to the firmware, yet we didn't
return an error to mac80211.
Mac80211 was thinking that we have the station and because of that,
sta_info::uploaded was set to 1. This allowed
ieee80211_find_sta_by_ifaddr() to return a valid station object, but
that ieee80211_sta didn't have any iwl_mvm_sta object initialized and
that caused the crash mentioned earlier when we got Rx on that station.

Cc: stable@vger.kernel.org
Fixes: 57974a55d995 ("wifi: iwlwifi: mvm: refactor iwl_mvm_mac_sta_state_common()")
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240206175739.1f76c44b2486.I6a00955e2842f15f0a089db2f834adb9d10fbe35@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index a25ea638229b04f90c3fdec12f45975d65a7337b..0aeca64725da6acf96d6b4552c3084cde542043d 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -3666,6 +3666,9 @@ iwl_mvm_sta_state_notexist_to_none(struct iwl_mvm *mvm,
                                           NL80211_TDLS_SETUP);
        }
 
+       if (ret)
+               return ret;
+
        for_each_sta_active_link(vif, sta, link_sta, i)
                link_sta->agg.max_rc_amsdu_len = 1;
 

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
index 8d1e44fd9de73b18fcc631aa8deefc2bf2583743..82b4d4d01097a53133557097b9dcd8cc70bf1100 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c
@@ -503,6 +503,10 @@ static bool iwl_mvm_is_dup(struct ieee80211_sta *sta, int queue,
                return false;
 
        mvm_sta = iwl_mvm_sta_from_mac80211(sta);
+
+       if (WARN_ON_ONCE(!mvm_sta->dup_data))
+               return false;
+
        dup_data = &mvm_sta->dup_data[queue];
 
        /*