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When a skb is delivered to a registered callback, cn_call_callback() incorrectly returns -ENODEV after freeing the skb, causing cn_rx_skb() to free the skb a second time. Reported-by: Eric B Munson <[email protected]> Signed-off-by: Patrick McHardy <[email protected]> Tested-by: Eric B Munson <[email protected]> Signed-off-by: David S. Miller <[email protected]>