linux-kernel - [PATCH net-next 2/8] ipv6: Use nlmsg

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Message-Id: <20250415-nlmsg_v2-v1-2-a1c75d493fd7@debian.org>
Date: Tue, 15 Apr 2025 12:28:53 -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 2/8] ipv6: Use nlmsg_payload in addrconf file

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

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 net/ipv6/addrconf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 4af2761795428..ec6c4ca6d6d99 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -6112,7 +6112,8 @@ static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
 {
 	struct ifinfomsg *ifm;

-	if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
+	ifm = nlmsg_payload(nlh, sizeof(*ifm));
+	if (!ifm) {
 		NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
 		return -EINVAL;
 	}
@@ -6122,7 +6123,6 @@ static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
 		return -EINVAL;
 	}

-	ifm = nlmsg_data(nlh);
 	if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
 	    ifm->ifi_change || ifm->ifi_index) {
 		NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");

-- 
2.47.1