diff --git a/tools/testing/selftests/net/gro.c b/tools/testing/selftests/net/gro.c
index 30024d0ed373..b204df4f3332 100644
--- a/tools/testing/selftests/net/gro.c
+++ b/tools/testing/selftests/net/gro.c
@@ -113,6 +113,9 @@ static void setup_sock_filter(int fd)
 		next_off = offsetof(struct ipv6hdr, nexthdr);
 	ipproto_off = ETH_HLEN + next_off;
 
+	/* Overridden later if exthdrs are used: */
+	opt_ipproto_off = ipproto_off;
+
 	if (strcmp(testname, "ip") == 0) {
 		if (proto == PF_INET)
 			optlen = sizeof(struct ip_timestamp);
diff --git a/tools/testing/selftests/net/ip_local_port_range.c b/tools/testing/selftests/net/ip_local_port_range.c
index 75e3fdacdf73..2465ff5bb3a8 100644
--- a/tools/testing/selftests/net/ip_local_port_range.c
+++ b/tools/testing/selftests/net/ip_local_port_range.c
@@ -343,7 +343,7 @@ TEST_F(ip_local_port_range, late_bind)
 		struct sockaddr_in v4;
 		struct sockaddr_in6 v6;
 	} addr;
-	socklen_t addr_len;
+	socklen_t addr_len = 0;
 	const int one = 1;
 	int fd, err;
 	__u32 range;
diff --git a/tools/testing/selftests/net/mptcp/pm_nl_ctl.c b/tools/testing/selftests/net/mptcp/pm_nl_ctl.c
index 49369c4a5f26..763402dd1774 100644
--- a/tools/testing/selftests/net/mptcp/pm_nl_ctl.c
+++ b/tools/testing/selftests/net/mptcp/pm_nl_ctl.c
@@ -1239,7 +1239,7 @@ int add_listener(int argc, char *argv[])
 	struct sockaddr_storage addr;
 	struct sockaddr_in6 *a6;
 	struct sockaddr_in *a4;
-	u_int16_t family;
+	u_int16_t family = AF_UNSPEC;
 	int enable = 1;
 	int sock;
 	int err;