netdev - [PATCH net-next 1/8] ipv6: Use nlmsg

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Message-Id: <20250415-nlmsg_v2-v1-1-a1c75d493fd7@debian.org>
Date: Tue, 15 Apr 2025 12:28:52 -0700
From: Breno Leitao <leitao@...ian.org>
To: kuniyu@...zon.com, "David S. Miller" <davem@...emloft.net>, 
 David Ahern <dsahern@...nel.org>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Breno Leitao <leitao@...ian.org>, kernel-team@...a.com
Subject: [PATCH net-next 1/8] ipv6: Use nlmsg_payload in addrlabel file

Leverage the new nlmsg_payload() helper to avoid checking for message
size and then reading the nlmsg data.

This changes function ip6addrlbl_valid_get_req() and
ip6addrlbl_valid_dump_req().

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 net/ipv6/addrlabel.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c
index ab054f329e12d..fb63ffbcfc647 100644
--- a/net/ipv6/addrlabel.c
+++ b/net/ipv6/addrlabel.c
@@ -473,12 +473,12 @@ static int ip6addrlbl_valid_dump_req(const struct nlmsghdr *nlh,
 {
 	struct ifaddrlblmsg *ifal;

-	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifal))) {
+	ifal = nlmsg_payload(nlh, sizeof(*ifal));
+	if (!ifal) {
 		NL_SET_ERR_MSG_MOD(extack, "Invalid header for address label dump request");
 		return -EINVAL;
 	}

-	ifal = nlmsg_data(nlh);
 	if (ifal->__ifal_reserved || ifal->ifal_prefixlen ||
 	    ifal->ifal_flags || ifal->ifal_index || ifal->ifal_seq) {
 		NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address label dump request");
@@ -543,7 +543,8 @@ static int ip6addrlbl_valid_get_req(struct sk_buff *skb,
 	struct ifaddrlblmsg *ifal;
 	int i, err;

-	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifal))) {
+	ifal = nlmsg_payload(nlh, sizeof(*ifal));
+	if (!ifal) {
 		NL_SET_ERR_MSG_MOD(extack, "Invalid header for addrlabel get request");
 		return -EINVAL;
 	}
@@ -552,7 +553,6 @@ static int ip6addrlbl_valid_get_req(struct sk_buff *skb,
 		return nlmsg_parse_deprecated(nlh, sizeof(*ifal), tb,
 					      IFAL_MAX, ifal_policy, extack);

-	ifal = nlmsg_data(nlh);
 	if (ifal->__ifal_reserved || ifal->ifal_flags || ifal->ifal_seq) {
 		NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for addrlabel get request");
 		return -EINVAL;

-- 
2.47.1