linux-kernel - [PATCH 4.4 43/56] xfrm_user: fix return value from xfrm_user_rcv

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Date:   Mon, 14 May 2018 08:48:48 +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, Yi Zhao <yi.zhao@...driver.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Nathan Harold <nharold@...gle.com>
Subject: [PATCH 4.4 43/56] xfrm_user: fix return value from xfrm_user_rcv_msg

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

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

From: Yi Zhao <yi.zhao@...driver.com>

commit 83e2d0587ae859aae75fd9d246c409b10a6bd137 upstream.

It doesn't support to run 32bit 'ip' to set xfrm objdect on 64bit host.
But the return value is unknown for user program:

ip xfrm policy list
RTNETLINK answers: Unknown error 524

Replace ENOTSUPP with EOPNOTSUPP:

ip xfrm policy list
RTNETLINK answers: Operation not supported

Signed-off-by: Yi Zhao <yi.zhao@...driver.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Nathan Harold <nharold@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/xfrm/xfrm_user.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2480,7 +2480,7 @@ static int xfrm_user_rcv_msg(struct sk_b
 
 #ifdef CONFIG_COMPAT
 	if (is_compat_task())
-		return -ENOTSUPP;
+		return -EOPNOTSUPP;
 #endif
 
 	type = nlh->nlmsg_type;