linux-kernel - [PATCH net-next 7/8] selftests: mptcp: diag: drop nlh parameter of recv

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Message-Id: <20250411-net-next-mptcp-sched-mib-sft-misc-v1-7-85ac8c6654c3@kernel.org>
Date: Fri, 11 Apr 2025 13:04:53 +0200
From: "Matthieu Baerts (NGI0)" <matttbe@...nel.org>
To: mptcp@...ts.linux.dev, Mat Martineau <martineau@...nel.org>, 
 Geliang Tang <geliang@...nel.org>, "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>, 
 Shuah Khan <shuah@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, 
 "Matthieu Baerts (NGI0)" <matttbe@...nel.org>, 
 Geliang Tang <geliang@...nel.org>
Subject: [PATCH net-next 7/8] selftests: mptcp: diag: drop nlh parameter of
 recv_nlmsg

From: Geliang Tang <geliang@...nel.org>

It's strange that 'nlh' variable is set to NULL in get_mptcpinfo() and then
this NULL pointer is passed to recv_nlmsg(). In fact, this variable should
be defined in recv_nlmsg(), not get_mptcpinfo().

So this patch drops this useless 'nlh' parameter of recv_nlmsg() and define
'nlh' variable in recv_nlmsg().

Signed-off-by: Geliang Tang <tanggeliang@...inos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>
---
 tools/testing/selftests/net/mptcp/mptcp_diag.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_diag.c b/tools/testing/selftests/net/mptcp/mptcp_diag.c
index 284286c524cfeff5f49b0af1a4da5a376c9e3140..37d5015ad08c44485f1964593ecb1a7b25d95934 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_diag.c
+++ b/tools/testing/selftests/net/mptcp/mptcp_diag.c
@@ -185,9 +185,10 @@ static void parse_nlmsg(struct nlmsghdr *nlh)
 	}
 }

-static void recv_nlmsg(int fd, struct nlmsghdr *nlh)
+static void recv_nlmsg(int fd)
 {
 	char rcv_buff[8192];
+	struct nlmsghdr *nlh = (struct nlmsghdr *)rcv_buff;
 	struct sockaddr_nl rcv_nladdr = {
 		.nl_family = AF_NETLINK
 	};
@@ -204,7 +205,6 @@ static void recv_nlmsg(int fd, struct nlmsghdr *nlh)
 	int len;

 	len = recvmsg(fd, &rcv_msg, 0);
-	nlh = (struct nlmsghdr *)rcv_buff;

 	while (NLMSG_OK(nlh, len)) {
 		if (nlh->nlmsg_type == NLMSG_DONE) {
@@ -225,7 +225,6 @@ static void recv_nlmsg(int fd, struct nlmsghdr *nlh)

 static void get_mptcpinfo(__u32 token)
 {
-	struct nlmsghdr *nlh = NULL;
 	int fd;

 	fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG);
@@ -233,7 +232,7 @@ static void get_mptcpinfo(__u32 token)
 		die_perror("Netlink socket");

 	send_query(fd, token);
-	recv_nlmsg(fd, nlh);
+	recv_nlmsg(fd);

 	close(fd);
 }

-- 
2.48.1