net/atm: sk_err_soft must be positive

The sk_err and sk_err_soft fields are positive errno values and
userspace applications rely on this when using getsockopt(SO_ERROR).

ATM code places an -errno into sk_err_soft in sigd_send() and returns it
from svc_addparty()/svc_dropparty().

Although I am not familiar with ATM code I came to this conclusion
because:

1. sigd_send() msg->type cases as_okay and as_error both have:

   sk->sk_err = -msg->reply;

   while the as_addparty and as_dropparty cases have:

   sk->sk_err_soft = msg->reply;

   This is the source of the inconsistency.

2. svc_addparty() returns an -errno and assumes sk_err_soft is also an
   -errno:

       if (flags & O_NONBLOCK) {
           error = -EINPROGRESS;
           goto out;
       }
       ...
       error = xchg(&sk->sk_err_soft, 0);
   out:
       release_sock(sk);
       return error;

   This shows that sk_err_soft is indeed being treated as an -errno.

This patch ensures that sk_err_soft is always a positive errno.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 3 insertions, 3 deletions

diff --git a/net/atm/signaling.c b/net/atm/signaling.c
index 4fd6af47383a..adb6e3d21b1e 100644
--- a/net/atm/signaling.c
+++ b/net/atm/signaling.c
@@ -124,7 +124,7 @@ as_indicate_complete:
                 break;
         case as_addparty:
         case as_dropparty:
-                sk->sk_err_soft = msg->reply;
+                sk->sk_err_soft = -msg->reply;
                                         /* < 0 failure, otherwise ep_ref */
                 clear_bit(ATM_VF_WAITING, &vcc->flags);
                 break;
diff --git a/net/atm/svc.c b/net/atm/svc.c
index 3fa0a9ee98d1..878563a8354d 100644
--- a/net/atm/svc.c
+++ b/net/atm/svc.c
@@ -546,7 +546,7 @@ static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
                 schedule();
         }
         finish_wait(sk_sleep(sk), &wait);
-        error = xchg(&sk->sk_err_soft, 0);
+        error = -xchg(&sk->sk_err_soft, 0);
 out:
         release_sock(sk);
         return error;
@@ -573,7 +573,7 @@ static int svc_dropparty(struct socket *sock, int ep_ref)
                 error = -EUNATCH;
                 goto out;
         }
-        error = xchg(&sk->sk_err_soft, 0);
+        error = -xchg(&sk->sk_err_soft, 0);
 out:
         release_sock(sk);
         return error;