[PATCH 4.19 51/79] selftests: net: reuseport_dualstack: fix uninitalized parameter

[Greg Kroah-Hartman]

From: Wei Wang <weiwan@xxxxxxxxxx>

[ Upstream commit d64479a3e3f9924074ca7b50bd72fa5211dca9c1 ]

This test reports EINVAL for getsockopt(SOL_SOCKET, SO_DOMAIN)
occasionally due to the uninitialized length parameter.
Initialize it to fix this, and also use int for "test_family" to comply
with the API standard.

Fixes: d6a61f80b871 ("soreuseport: test mixed v4/v6 sockets")
Reported-by: Maciej Åenczykowski <maze@xxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Wei Wang <weiwan@xxxxxxxxxx>
Cc: Craig Gallek <cgallek@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 tools/testing/selftests/net/reuseport_dualstack.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/tools/testing/selftests/net/reuseport_dualstack.c
+++ b/tools/testing/selftests/net/reuseport_dualstack.c
@@ -129,7 +129,7 @@ static void test(int *rcv_fds, int count
 {
 	struct epoll_event ev;
 	int epfd, i, test_fd;
-	uint16_t test_family;
+	int test_family;
 	socklen_t len;
 
 	epfd = epoll_create(1);
@@ -146,6 +146,7 @@ static void test(int *rcv_fds, int count
 	send_from_v4(proto);
 
 	test_fd = receive_once(epfd, proto);
+	len = sizeof(test_family);
 	if (getsockopt(test_fd, SOL_SOCKET, SO_DOMAIN, &test_family, &len))
 		error(1, errno, "failed to read socket domain");
 	if (test_family != AF_INET)