linux-kernel - [PATCH] selftests/bpf: Fix check in global_data

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Message-Id: <20200903200528.747884-1-haoluo@google.com>
Date:   Thu,  3 Sep 2020 13:05:28 -0700
From:   Hao Luo <haoluo@...gle.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc:     Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        "Toke Høiland-Jørgensen" <toke@...hat.com>,
        KP Singh <kpsingh@...omium.org>, Hao Luo <haoluo@...gle.com>
Subject: [PATCH] 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@...gle.com>
---
 tools/testing/selftests/bpf/prog_tests/global_data_init.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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 3bdaa5a40744..ee46b11f1f9a 100644
--- 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");
-- 
2.28.0.526.ge36021eeef-goog