netdev - [PATCH bpf v2] selftests: bpf: initialize bpf

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Message-Id: <20190508164932.28729-1-lmb@cloudflare.com>
Date:   Wed,  8 May 2019 17:49:32 +0100
From:   Lorenz Bauer <lmb@...udflare.com>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, kafai@...com
Cc:     Lorenz Bauer <lmb@...udflare.com>
Subject: [PATCH bpf v2] selftests: bpf: initialize bpf_object pointers where needed

There are a few tests which call bpf_object__close on uninitialized
bpf_object*, which may segfault. Explicitly zero-initialise these pointers
to avoid this.

Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
---
 tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c  | 2 +-
 tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c | 2 +-
 tools/testing/selftests/bpf/prog_tests/tp_attach_query.c  | 3 +++
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c b/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
index 23b159d95c3f..b74e2f6e96d0 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
@@ -15,7 +15,7 @@ static int libbpf_debug_print(enum libbpf_print_level level,
 static int check_load(const char *file)
 {
 	struct bpf_prog_load_attr attr;
-	struct bpf_object *obj;
+	struct bpf_object *obj = NULL;
 	int err, prog_fd;
 
 	memset(&attr, 0, sizeof(struct bpf_prog_load_attr));
diff --git a/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c b/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c
index d636a4f39476..f9b70e81682b 100644
--- a/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c
+++ b/tools/testing/selftests/bpf/prog_tests/task_fd_query_tp.c
@@ -9,7 +9,7 @@ static void test_task_fd_query_tp_core(const char *probe_name,
 	struct perf_event_attr attr = {};
 	__u64 probe_offset, probe_addr;
 	__u32 len, prog_id, fd_type;
-	struct bpf_object *obj;
+	struct bpf_object *obj = NULL;
 	__u32 duration = 0;
 	char buf[256];
 
diff --git a/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c b/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
index a2f476f91637..fb095e5cd9af 100644
--- a/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
+++ b/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
@@ -13,6 +13,9 @@ void test_tp_attach_query(void)
 	struct bpf_prog_info prog_info;
 	char buf[256];
 
+	for (i = 0; i < num_progs; i++)
+		obj[i] = NULL;
+
 	snprintf(buf, sizeof(buf),
 		 "/sys/kernel/debug/tracing/events/sched/sched_switch/id");
 	efd = open(buf, O_RDONLY, 0);
-- 
2.19.1