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Felix Fietkau
bd41e0fbea
mt7615_tx() falls back to the vif BSS wcid when mac80211 hands a frame over without a station, e.g. while a station is being torn down, and to the global wcid when there is no vif either. Both tx_prepare_skb implementations derive a mt7615_sta from that wcid unconditionally and, if the rate control probe flag is set, pass it to mt7615_mac_set_rates(), which dereferences the NULL vif backpointer of the per-vif embedded sta: Unable to handle kernel read from unreadable memory at virtual address 0000000000000002 ... pc : mt7615_mac_set_rates lr : mt7615_tx_prepare_skb Neither entry is rate controlled by mac80211: the embedded sta has an empty rate set, and for the global wcid the container_of does not yield a valid mt7615_sta at all. Only resolve the sta for wcids that belong to a station. Reported-by: Chad Monroe <[email protected]> Signed-off-by: Felix Fietkau <[email protected]>