x25: Prevent skb overreads when checking call user data
x25_find_listener does not check that the amount of call user data given in the skb is big enough in per-socket comparisons, hence buffer overreads may occur. Fix this by adding a check. Signed-off-by: NMatthew Daley <mattjd@gmail.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Andrew Hendry <andrew.hendry@gmail.com> Cc: stable <stable@kernel.org> Acked-by: NAndrew Hendry <andrew.hendry@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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