linux-kernel - [PATCH net-next v2 4/7] selftests/net: Don't forget to close nsfd after switch_save

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Message-Id: <20240802-tcp-ao-selftests-upd-6-12-v2-4-370c99358161@gmail.com>
Date: Fri, 02 Aug 2024 10:23:28 +0100
From: Dmitry Safonov via B4 Relay <devnull+0x7f454c46.gmail.com@...nel.org>
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>
Cc: Mohammad Nassiri <mnassiri@...na.com>, netdev@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Dmitry Safonov <0x7f454c46@...il.com>
Subject: [PATCH net-next v2 4/7] selftests/net: Don't forget to close nsfd
 after switch_save_ns()

From: Dmitry Safonov <0x7f454c46@...il.com>

The switch_save_ns() helper suppose to help switching to another
namespace for some action and to return back to original namespace.

The fd should be closed.

Signed-off-by: Dmitry Safonov <0x7f454c46@...il.com>
---
 tools/testing/selftests/net/tcp_ao/lib/setup.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/net/tcp_ao/lib/setup.c b/tools/testing/selftests/net/tcp_ao/lib/setup.c
index e408b9243b2c..4e6820e7cb86 100644
--- a/tools/testing/selftests/net/tcp_ao/lib/setup.c
+++ b/tools/testing/selftests/net/tcp_ao/lib/setup.c
@@ -142,6 +142,13 @@ int switch_save_ns(int new_ns)
 	return ret;
 }

+void switch_close_ns(int fd)
+{
+	if (setns(fd, CLONE_NEWNET))
+		test_error("setns()");
+	close(fd);
+}
+
 static int nsfd_outside	= -1;
 static int nsfd_parent	= -1;
 static int nsfd_child	= -1;
@@ -296,7 +303,7 @@ static bool is_optmem_namespaced(void)
 		int old_ns = switch_save_ns(nsfd_child);

 		optmem_ns = !access(optmem_file, F_OK);
-		switch_ns(old_ns);
+		switch_close_ns(old_ns);
 	}
 	return !!optmem_ns;
 }
@@ -317,7 +324,7 @@ size_t test_get_optmem(void)
 		test_error("can't read from %s", optmem_file);
 	fclose(foptmem);
 	if (!is_optmem_namespaced())
-		switch_ns(old_ns);
+		switch_close_ns(old_ns);
 	return ret;
 }

@@ -339,7 +346,7 @@ static void __test_set_optmem(size_t new, size_t *old)
 		test_error("can't write %zu to %s", new, optmem_file);
 	fclose(foptmem);
 	if (!is_optmem_namespaced())
-		switch_ns(old_ns);
+		switch_close_ns(old_ns);
 }

 static void test_revert_optmem(void)

-- 
2.42.2