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The peer_pid must be checked in all cases when a queue exists, currently it is not checked if for NFQA_CFG_QUEUE_MAXLEN when a NFQA_CFG_CMD attribute exists in some cases. Same for the queue existance check, which can cause a NULL pointer dereference. Also consistently return -ENODEV for "queue not found". -ENOENT would be better, but that is already used to indicate a queued skb id doesn't exist. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>