netdev - [PATCH AUTOSEL 5.6 224/606] nexthop: Fix attribute checking for groups

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Date:   Mon,  8 Jun 2020 19:05:49 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     David Ahern <dsahern@...il.com>,
        ASSOGBA Emery <assogba.emery@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.6 224/606] nexthop: Fix attribute checking for groups

From: David Ahern <dsahern@...il.com>

[ Upstream commit 84be69b869a5a496a6cfde9b3c29509207a1f1fa ]

For nexthop groups, attributes after NHA_GROUP_TYPE are invalid, but
nh_check_attr_group starts checking at NHA_GROUP. The group type defaults
to multipath and the NHA_GROUP_TYPE is currently optional so this has
slipped through so far. Fix the attribute checking to handle support of
new group types.

Fixes: 430a049190de ("nexthop: Add support for nexthop groups")
Signed-off-by: ASSOGBA Emery <assogba.emery@...il.com>
Signed-off-by: David Ahern <dsahern@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/nexthop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index 489c27f894d7..b03ea728d9a3 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -434,7 +434,7 @@ static int nh_check_attr_group(struct net *net, struct nlattr *tb[],
 		if (!valid_group_nh(nh, len, extack))
 			return -EINVAL;
 	}
-	for (i = NHA_GROUP + 1; i < __NHA_MAX; ++i) {
+	for (i = NHA_GROUP_TYPE + 1; i < __NHA_MAX; ++i) {
 		if (!tb[i])
 			continue;
 
-- 
2.25.1