linux-kernel - [PATCH bpf-next v2 2/2] selftests/bpf: Add malloc failure checks in bpf

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Message-ID: <DB3PR10MB6835A2CBEE0EBE31D07FABFAE8DDA@DB3PR10MB6835.EURPRD10.PROD.OUTLOOK.COM>
Date:   Thu, 26 Oct 2023 07:33:19 +0530
From:   Yuran Pereira <yuran.pereira@...mail.com>
To:     bpf@...r.kernel.org, yonghong.song@...ux.dev
Cc:     sinquersw@...il.com, shuah@...nel.org, ast@...nel.org,
        daniel@...earbox.net, song@...nel.org, 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,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yuran Pereira <yuran.pereira@...mail.com>
Subject: [PATCH bpf-next v2 2/2] selftests/bpf: Add malloc failure 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 | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
index 7db6972ed952..955d374ba656 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
@@ -698,7 +698,7 @@ static void test_overflow(bool test_e2big_overflow, bool ret1)
 		goto free_link;
 
 	buf = malloc(expected_read_len);
-	if (!buf)
+	if (!ASSERT_OK_PTR(buf, "malloc"))
 		goto close_iter;
 
 	/* do read */
@@ -869,6 +869,8 @@ static void test_bpf_percpu_hash_map(void)
 
 	skel->rodata->num_cpus = bpf_num_possible_cpus();
 	val = malloc(8 * bpf_num_possible_cpus());
+	if (!ASSERT_OK_PTR(val, "malloc"))
+		goto out;
 
 	err = bpf_iter_bpf_percpu_hash_map__load(skel);
 	if (!ASSERT_OK_PTR(skel, "bpf_iter_bpf_percpu_hash_map__load"))
@@ -1046,6 +1048,8 @@ static void test_bpf_percpu_array_map(void)
 
 	skel->rodata->num_cpus = bpf_num_possible_cpus();
 	val = malloc(8 * bpf_num_possible_cpus());
+	if (!ASSERT_OK_PTR(val, "malloc"))
+		goto out;
 
 	err = bpf_iter_bpf_percpu_array_map__load(skel);
 	if (!ASSERT_OK_PTR(skel, "bpf_iter_bpf_percpu_array_map__load"))
-- 
2.25.1