linux-kernel - [PATCH 4.14 253/496] xfrm: fix rcu_read_unlock usage in xfrm_local

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Message-Id: <20180528100330.553051491@linuxfoundation.org>
Date:   Mon, 28 May 2018 12:00:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Taehee Yoo <ap420073@...il.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 253/496] xfrm: fix rcu_read_unlock usage in xfrm_local_error

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

------------------

From: Taehee Yoo <ap420073@...il.com>

[ Upstream commit 46c0ef6e1eb95f619d9f62da4332749153db92f7 ]

In the xfrm_local_error, rcu_read_unlock should be called when afinfo
is not NULL. because xfrm_state_get_afinfo calls rcu_read_unlock
if afinfo is NULL.

Fixes: af5d27c4e12b ("xfrm: remove xfrm_state_put_afinfo")
Signed-off-by: Taehee Yoo <ap420073@...il.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/xfrm/xfrm_output.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -285,8 +285,9 @@ void xfrm_local_error(struct sk_buff *sk
 		return;
 
 	afinfo = xfrm_state_get_afinfo(proto);
-	if (afinfo)
+	if (afinfo) {
 		afinfo->local_error(skb, mtu);
-	rcu_read_unlock();
+		rcu_read_unlock();
+	}
 }
 EXPORT_SYMBOL_GPL(xfrm_local_error);