net: clear sk_err_soft in sk_clone_lock()

[ Upstream commit e551c32d57c88923f99f8f010e89ca7ed0735e83 ]

At accept() time, it is possible the parent has a non zero
sk_err_soft, leftover from a prior error.

Make sure we do not leave this value in the child, as it
makes future getsockopt(SO_ERROR) calls quite unreliable.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/core/sock.c b/net/core/sock.c
index b8f4f35..a1a3a50 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1259,6 +1259,7 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
                }
 
                newsk->sk_err      = 0;
                }
 
                newsk->sk_err      = 0;

+               newsk->sk_err_soft = 0;

                newsk->sk_priority = 0;
                /*
                 * Before updating sk_refcnt, we must commit prior changes to memory
                newsk->sk_priority = 0;
                /*
                 * Before updating sk_refcnt, we must commit prior changes to memory