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af_unix: do not report POLLOUT on listeners

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poll(POLLOUT) on a listener should not report fd is ready for
a write().

This would break some applications using poll() and pfd.events = -1,
as they would not block in poll()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Alan Burlison <Alan.Burlison@oracle.com>
Tested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-23 10:59:16 -07:00 • committed by David S. Miller
parent 742e038330
commit 1586a5877d
1 changed files with 3 additions and 2 deletions
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5
net/unix/af_unix.c
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@ -326,9 +326,10 @@ found:
return s; return s;
} }
static inline int unix_writable(struct sock *sk) static int unix_writable(const struct sock *sk)
{ {
return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; return sk->sk_state != TCP_LISTEN &&
(atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf;
} }
static void unix_write_space(struct sock *sk) static void unix_write_space(struct sock *sk)