[PATCH AUTOSEL 5.8 61/63] bpf: selftests: global_funcs: Check err_str before strstr
From: Sasha Levin <sashal@kernel.org>
Date: 2020-08-24 16:40:03
Also in:
bpf, linux-kselftest, lkml, stable
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [selftests] (test runners & infrastructure), kernel selftest framework, the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Shuah Khan, Linus Torvalds
From: Yauheni Kaliuta <redacted> [ Upstream commit c210773d6c6f595f5922d56b7391fe343bc7310e ] The error path in libbpf.c:load_program() has calls to pr_warn() which ends up for global_funcs tests to test_global_funcs.c:libbpf_debug_print(). For the tests with no struct test_def::err_str initialized with a string, it causes call of strstr() with NULL as the second argument and it segfaults. Fix it by calling strstr() only for non-NULL err_str. Signed-off-by: Yauheni Kaliuta <redacted> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <redacted> Link: https://lore.kernel.org/bpf/20200820115843.39454-1-yauheni.kaliuta@redhat.com (local) Signed-off-by: Sasha Levin <sashal@kernel.org> --- tools/testing/selftests/bpf/prog_tests/test_global_funcs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/test_global_funcs.c b/tools/testing/selftests/bpf/prog_tests/test_global_funcs.c
index 25b068591e9a4..193002b14d7f6 100644
--- a/tools/testing/selftests/bpf/prog_tests/test_global_funcs.c
+++ b/tools/testing/selftests/bpf/prog_tests/test_global_funcs.c@@ -19,7 +19,7 @@ static int libbpf_debug_print(enum libbpf_print_level level, log_buf = va_arg(args, char *); if (!log_buf) goto out; - if (strstr(log_buf, err_str) == 0) + if (err_str && strstr(log_buf, err_str) == 0) found = true; out: printf(format, log_buf);
--
2.25.1