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af_unix: fix shutdown parameter checking 

Return -EINVAL rather than 0 given an invalid "mode" parameter.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xi Wang 2012-08-26 16:47:13 +00:00 committed by David S. Miller
parent 46b66d7077
commit fc61b928dc
1 changed files with 8 additions and 4 deletions
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12
net/unix/af_unix.c
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@ -2060,10 +2060,14 @@ static int unix_shutdown(struct socket *sock, int mode)
struct sock *sk = sock->sk;
struct sock *other;
mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN);
if (!mode)
return 0;
if (mode < SHUT_RD || mode > SHUT_RDWR)
return -EINVAL;
/* This maps:
* SHUT_RD (0) -> RCV_SHUTDOWN (1)
* SHUT_WR (1) -> SEND_SHUTDOWN (2)
* SHUT_RDWR (2) -> SHUTDOWN_MASK (3)
*/
++mode;
unix_state_lock(sk);
sk->sk_shutdown |= mode;