5.1-stable patches

[thirdparty/kernel/stable-queue.git] / releases / 4.8.10 / net-clear-sk_err_soft-in-sk_clone_lock.patch

From foo@baz Fri Nov 18 11:35:46 CET 2016
From: Eric Dumazet <edumazet@google.com>
Date: Fri, 28 Oct 2016 13:40:24 -0700
Subject: net: clear sk_err_soft in sk_clone_lock()

From: Eric Dumazet <edumazet@google.com>


[ 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/core/sock.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1563,6 +1563,7 @@ struct sock *sk_clone_lock(const struct
 		RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
 
 		newsk->sk_err	   = 0;
+		newsk->sk_err_soft = 0;
 		newsk->sk_priority = 0;
 		newsk->sk_incoming_cpu = raw_smp_processor_id();
 		atomic64_set(&newsk->sk_cookie, 0);