linux-kernel - [PATCH 3.12 098/127] net: clear sk_err_soft in sk_clone

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Message-Id: <acef2a6a1bdfca97b798e1d2630b725645100e37.1480062521.git.jslaby@suse.cz>
Date:   Fri, 25 Nov 2016 09:30:11 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 098/127] net: clear sk_err_soft in sk_clone_lock()

From: Eric Dumazet <edumazet@...gle.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ 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@...gle.com>
Acked-by: Soheil Hassas Yeganeh <soheil@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/core/sock.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/core/sock.c b/net/core/sock.c
index 516b45c82093..73c6093e136a 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1537,6 +1537,7 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
 		}
 
 		newsk->sk_err	   = 0;
+		newsk->sk_err_soft = 0;
 		newsk->sk_priority = 0;
 		/*
 		 * Before updating sk_refcnt, we must commit prior changes to memory
-- 
2.10.2