linux-kernel - [PATCH v2 08/13] selftests: net: netlink-dumps: Avoid uninitialized variable warning

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Message-ID: <20251205171010.515236-9-linux@roeck-us.net>
Date: Fri,  5 Dec 2025 09:10:02 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Shuah Khan <shuah@...nel.org>
Cc: Jakub Kicinski <kuba@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Kees Cook <kees@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	wine-devel@...ehq.org,
	netdev@...r.kernel.org,
	bpf@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH v2 08/13] selftests: net: netlink-dumps: Avoid uninitialized variable warning

The following warning is seen when building netlink-dumps.

netlink-dumps.c: In function ‘dump_extack’:
../kselftest_harness.h:788:35: warning: ‘ret’ may be used uninitialized

Problem is that the loop which initializes 'ret' may exit early without
initializing the variable if recv() returns an error. Always initialize
'ret' to solve the problem.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
v2: Update subject and description to reflect that the patch fixes a build
    warning. 

 tools/testing/selftests/net/netlink-dumps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/netlink-dumps.c b/tools/testing/selftests/net/netlink-dumps.c
index 679b6c77ace7..67bf3fc2d66b 100644
--- a/tools/testing/selftests/net/netlink-dumps.c
+++ b/tools/testing/selftests/net/netlink-dumps.c
@@ -112,7 +112,7 @@ static const struct {
 TEST(dump_extack)
 {
 	int netlink_sock;
-	int i, cnt, ret;
+	int i, cnt, ret = FOUND_ERR;
 	char buf[8192];
 	int one = 1;
 	ssize_t n;
-- 
2.45.2