linux-kernel - [PATCH 4.19 122/422] rtnetlink: move type calculation out of loop

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Message-Id: <20191119051406.920820019@linuxfoundation.org>
Date:   Tue, 19 Nov 2019 06:15:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Christian Brauner <christian@...uner.io>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 122/422] rtnetlink: move type calculation out of loop

From: Christian Brauner <christian@...uner.io>

[ Upstream commit 87ccbb1f943625884b824c5560f635dcea8e4510 ]

I don't see how the type - which is one of
RTM_{GETADDR,GETROUTE,GETNETCONF} - can change. So do the message type
calculation once before entering the for loop.

Signed-off-by: Christian Brauner <christian@...uner.io>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/core/rtnetlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 95768a9fca06e..c0de73b125802 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3268,13 +3268,13 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
 {
 	int idx;
 	int s_idx = cb->family;
+	int type = cb->nlh->nlmsg_type - RTM_BASE;
 
 	if (s_idx == 0)
 		s_idx = 1;
 
 	for (idx = 1; idx <= RTNL_FAMILY_MAX; idx++) {
 		struct rtnl_link **tab;
-		int type = cb->nlh->nlmsg_type-RTM_BASE;
 		struct rtnl_link *link;
 		rtnl_dumpit_func dumpit;
 
-- 
2.20.1