linux-kernel - [PATCH net-next 5/9] mpls: Use nlmsg_payload in mpls_valid_fib_dump

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Message-Id: <20250411-nlmsg-v1-5-ddd4e065cb15@debian.org>
Date: Fri, 11 Apr 2025 10:00:52 -0700
From: Breno Leitao <leitao@...ian.org>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
 David Ahern <dsahern@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Breno Leitao <leitao@...ian.org>
Subject: [PATCH net-next 5/9] mpls: Use nlmsg_payload in
 mpls_valid_fib_dump_req

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/mpls/af_mpls.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 1f63b32d76d67..bf7cd290c2369 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -2095,12 +2095,12 @@ static int mpls_valid_fib_dump_req(struct net *net, const struct nlmsghdr *nlh,
 	struct rtmsg *rtm;
 	int err, i;

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

-	rtm = nlmsg_data(nlh);
 	if (rtm->rtm_dst_len || rtm->rtm_src_len  || rtm->rtm_tos   ||
 	    rtm->rtm_table   || rtm->rtm_scope    || rtm->rtm_type  ||
 	    rtm->rtm_flags) {

-- 
2.47.1