mac80211: add missing key check
ieee80211_tx_h_select_key might decide that a frame need not be encrypted at all, in which case it will clear tx->key. In that case it may crash if a key was previously selected, e.g. as the default key. This is also due to my patch "mac80211: move control.hw_key assignment". Signed-off-by: NJohannes Berg <johannes@sipsolutions.net> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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