selftests/bpf: Fix check in global_data_init.

The returned value of bpf_object__open_file() should be checked with
libbpf_get_error() rather than NULL. This fix prevents test_progs from
crash when test_global_data.o is not present.

Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200903200528.747884-1-haoluo@google.com

diff --git a/tools/testing/selftests/bpf/prog_tests/global_data_init.c b/tools/testing/selftests/bpf/prog_tests/global_data_init.c
index 3bdaa5a40744d367807170f1a952bcf59b64b334..ee46b11f1f9a208a0d62c70a8e6900beb7f3cc66 100644 (file)
--- a/tools/testing/selftests/bpf/prog_tests/global_data_init.c
+++ b/tools/testing/selftests/bpf/prog_tests/global_data_init.c
@@ -12,7 +12,8 @@ void test_global_data_init(void)
        size_t sz;
 
        obj = bpf_object__open_file(file, NULL);
-       if (CHECK_FAIL(!obj))
+       err = libbpf_get_error(obj);
+       if (CHECK_FAIL(err))
                return;
 
        map = bpf_object__find_map_by_name(obj, "test_glo.rodata");