linux-kernel - [PATCH] selftests: bpf: add malloc failures checks in bpf

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Date:   Tue, 24 Oct 2023 08:29:00 +0530
From:   Yuran Pereira <yuran.pereira@...mail.com>
To:     shuah@...nel.org
Cc:     Yuran Pereira <yuran.pereira@...mail.com>, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev,
        song@...nel.org, yonghong.song@...ux.dev, john.fastabend@...il.com,
        kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, mykolal@...com, brauner@...nel.org,
        iii@...ux.ibm.com, kuifeng@...a.com, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] selftests: bpf: add malloc failures checks in bpf_iter

Since some malloc calls in bpf_iter may at times fail,
this patch adds the appropriate fail checks, and ensures that
any previously allocated resource is appropriately destroyed
before returning the function.

Signed-off-by: Yuran Pereira <yuran.pereira@...mail.com>
---
 tools/testing/selftests/bpf/prog_tests/bpf_iter.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
index 1f02168103dd..6d47ea9211a4 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
@@ -878,6 +878,11 @@ static void test_bpf_percpu_hash_map(void)
 
 	skel->rodata->num_cpus = bpf_num_possible_cpus();
 	val = malloc(8 * bpf_num_possible_cpus());
+	if (CHECK(!val, "malloc", "memory allocation failed: %s",
+				strerror(errno))) {
+		bpf_iter_bpf_percpu_hash_map__destroy(skel);
+		return;
+	}
 
 	err = bpf_iter_bpf_percpu_hash_map__load(skel);
 	if (!ASSERT_OK_PTR(skel, "bpf_iter_bpf_percpu_hash_map__load"))
@@ -1057,6 +1062,11 @@ static void test_bpf_percpu_array_map(void)
 
 	skel->rodata->num_cpus = bpf_num_possible_cpus();
 	val = malloc(8 * bpf_num_possible_cpus());
+	if (CHECK(!val, "malloc", "memory allocation failed: %s",
+				strerror(errno))) {
+		bpf_iter_bpf_percpu_hash_map__destroy(skel);
+		return;
+	}
 
 	err = bpf_iter_bpf_percpu_array_map__load(skel);
 	if (!ASSERT_OK_PTR(skel, "bpf_iter_bpf_percpu_array_map__load"))
-- 
2.25.1