Various missing sanity checks caused rejected action frames to be interpreted as channel switch announcements, which can cause a client mode interface to switch away from its operating channel, thereby losing connectivity. This patch ensures that only spectrum management action frames are processed by the CSA handling function and prevents rejected action frames from getting processed by the MLME code. Signed-off-by: Felix Fietkau <nbd@xxxxxxxxxxx> Cc: stable@xxxxxxxxxx --- --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -1451,7 +1451,9 @@ static void ieee80211_sta_rx_queued_mgmt rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len); break; case IEEE80211_STYPE_ACTION: - /* XXX: differentiate, can only happen for CSA now! */ + if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) + break; + ieee80211_sta_process_chanswitch(sdata, &mgmt->u.action.u.chan_switch.sw_elem, (void *)ifmgd->associated->priv); --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -1934,6 +1934,10 @@ ieee80211_rx_h_action(struct ieee80211_r } break; default: + /* do not process rejected action frames */ + if (mgmt->u.action.category & 0x80) + return RX_DROP_MONITOR; + return RX_CONTINUE; } -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
