x25: Do not reference freed memory.
In x25_link_free(), we destroy 'nb' before dereferencing 'nb->dev'. Don't do this, because 'nb' might be freed by then. Reported-by:Randy Dunlap <randy.dunlap@oracle.com> Tested-by:
Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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