selftests/bpf: Extend test for sockmap update with same

Verify that the sockmap link was not severed, and socket's entry is indeed
removed from the map when the corresponding descriptor gets closed.

Signed-off-by: Michal Luczaj <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: John Fastabend <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

Author: mmhal

tools/testing/selftests/bpf/prog_tests/sockmap_basic.c

@@ -934,8 +934,10 @@ static void test_sockmap_same_sock(void)
 
 	err = socketpair(AF_UNIX, SOCK_STREAM, 0, stream);
 	ASSERT_OK(err, "socketpair(af_unix, sock_stream)");
-	if (err)
+	if (err) {
+		close(tcp);
 		goto out;
+	}
 
 	for (i = 0; i < 2; i++) {
 		err = bpf_map_update_elem(map, &zero, &stream[0], BPF_ANY);
@@ -954,14 +956,14 @@ static void test_sockmap_same_sock(void)
 		ASSERT_OK(err, "bpf_map_update_elem(tcp)");
 	}
 
+	close(tcp);
 	err = bpf_map_delete_elem(map, &zero);
-	ASSERT_OK(err, "bpf_map_delete_elem(entry)");
+	ASSERT_ERR(err, "bpf_map_delete_elem(entry)");
 
 	close(stream[0]);
 	close(stream[1]);
 out:
 	close(dgram);
-	close(tcp);
 	close(udp);
 	test_sockmap_pass_prog__destroy(skel);
 }