decnet: fix shutdown parameter checking
The allowed value of "how" is SHUT_RD/SHUT_WR/SHUT_RDWR (0/1/2), rather than SHUTDOWN_MASK (3). Signed-off-by: Xi Wang <xi.wang@gmail.com> Acked-by: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1313,10 +1313,10 @@ static int dn_shutdown(struct socket *sock, int how)
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if (scp->state == DN_O)
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goto out;
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if (how != SHUTDOWN_MASK)
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if (how != SHUT_RDWR)
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goto out;
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sk->sk_shutdown = how;
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sk->sk_shutdown = SHUTDOWN_MASK;
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dn_destroy_sock(sk);
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err = 0;
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