linux-kernel - [PATCH] Net: psock_tpacket: Fix null argument warning in walk

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Message-ID: <20250924044142.540162-1-wakel@google.com>
Date: Wed, 24 Sep 2025 12:41:42 +0800
From: Wake Liu <wakel@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>, 
	netdev@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Cc: Simon Horman <horms@...nel.org>, Wake Liu <wakel@...gle.com>
Subject: [PATCH] Net: psock_tpacket: Fix null argument warning in walk_tx

The sendto() call in walk_tx() was passing NULL as the buffer argument,
which can trigger a -Wnonnull warning with some compilers.

Although the size is 0 and no data is actually sent, passing a null
pointer is technically incorrect.

This commit changes NULL to an empty string literal ("") to satisfy the
non-null argument requirement and fix the compiler warning.

Signed-off-by: Wake Liu <wakel@...gle.com>
---
 tools/testing/selftests/net/psock_tpacket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/psock_tpacket.c b/tools/testing/selftests/net/psock_tpacket.c
index 221270cee3ea..0c24adbb292e 100644
--- a/tools/testing/selftests/net/psock_tpacket.c
+++ b/tools/testing/selftests/net/psock_tpacket.c
@@ -470,7 +470,7 @@ static void walk_tx(int sock, struct ring *ring)
 
 	bug_on(total_packets != 0);
 
-	ret = sendto(sock, NULL, 0, 0, NULL, 0);
+	ret = sendto(sock, "", 0, 0, NULL, 0);
 	if (ret == -1) {
 		perror("sendto");
 		exit(1);
-- 
2.51.0.534.gc79095c0ca-goog