linux-kernel - [PATCH] selftests/net: initialize char variable to null

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Message-ID: <20251124161324.16901-1-ankitkhushwaha.linux@gmail.com>
Date: Mon, 24 Nov 2025 21:43:24 +0530
From: Ankit Khushwaha <ankitkhushwaha.linux@...il.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	Jason Xing <kernelxing@...cent.com>,
	"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-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ankit Khushwaha <ankitkhushwaha.linux@...il.com>
Subject: [PATCH] selftests/net: initialize char variable to null

char variable in 'so_txtime.c' & 'txtimestamp.c' left uninitilized
by when switch default case taken. raises following warning.

	txtimestamp.c:240:2: warning: variable 'tsname' is used uninitialized
	whenever switch default is taken [-Wsometimes-uninitialized]

	so_txtime.c:210:3: warning: variable 'reason' is used uninitialized
	whenever switch default is taken [-Wsometimes-uninitialized]

initialize these variables to NULL to fix this.

Signed-off-by: Ankit Khushwaha <ankitkhushwaha.linux@...il.com>
---
 tools/testing/selftests/net/so_txtime.c   | 2 +-
 tools/testing/selftests/net/txtimestamp.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/net/so_txtime.c b/tools/testing/selftests/net/so_txtime.c
index 8457b7ccbc09..b76df1efc2ef 100644
--- a/tools/testing/selftests/net/so_txtime.c
+++ b/tools/testing/selftests/net/so_txtime.c
@@ -174,7 +174,7 @@ static int do_recv_errqueue_timeout(int fdt)
 	msg.msg_controllen = sizeof(control);

 	while (1) {
-		const char *reason;
+		const char *reason = NULL;

 		ret = recvmsg(fdt, &msg, MSG_ERRQUEUE);
 		if (ret == -1 && errno == EAGAIN)
diff --git a/tools/testing/selftests/net/txtimestamp.c b/tools/testing/selftests/net/txtimestamp.c
index dae91eb97d69..bcc14688661d 100644
--- a/tools/testing/selftests/net/txtimestamp.c
+++ b/tools/testing/selftests/net/txtimestamp.c
@@ -217,7 +217,7 @@ static void print_timestamp_usr(void)
 static void print_timestamp(struct scm_timestamping *tss, int tstype,
 			    int tskey, int payload_len)
 {
-	const char *tsname;
+	const char *tsname = NULL;

 	validate_key(tskey, tstype);

--
2.52.0