linux-kernel - [PATCH -next v2] bpf/benchs: Fix return value check of bpf_program_

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Date:   Mon, 1 Nov 2021 20:43:10 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>
CC:     <linux-kselftest@...r.kernel.org>, <shuah@...nel.org>,
        <ast@...nel.org>, <yhs@...com>
Subject: [PATCH -next v2] bpf/benchs: Fix return value check of bpf_program__attach()

If bpf_program__attach() fails, it never returns NULL,
we should use libbpf_get_error() to check the return value.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Acked-by: Yonghong Song <yhs@...com>
---
v2:
  don't use 'int err'
---
 .../selftests/bpf/benchs/bench_bloom_filter_map.c      | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c b/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c
index 6eeeed2913e6..4afaa4adb327 100644
--- a/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c
+++ b/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c
@@ -304,7 +304,7 @@ static void bloom_lookup_setup(void)
 	populate_maps();
 
 	link = bpf_program__attach(ctx.skel->progs.bloom_lookup);
-	if (!link) {
+	if (libbpf_get_error(link)) {
 		fprintf(stderr, "failed to attach program!\n");
 		exit(1);
 	}
@@ -321,7 +321,7 @@ static void bloom_update_setup(void)
 	populate_maps();
 
 	link = bpf_program__attach(ctx.skel->progs.bloom_update);
-	if (!link) {
+	if (libbpf_get_error(link)) {
 		fprintf(stderr, "failed to attach program!\n");
 		exit(1);
 	}
@@ -340,7 +340,7 @@ static void false_positive_setup(void)
 	populate_maps();
 
 	link = bpf_program__attach(ctx.skel->progs.bloom_hashmap_lookup);
-	if (!link) {
+	if (libbpf_get_error(link)) {
 		fprintf(stderr, "failed to attach program!\n");
 		exit(1);
 	}
@@ -358,7 +358,7 @@ static void hashmap_with_bloom_setup(void)
 	populate_maps();
 
 	link = bpf_program__attach(ctx.skel->progs.bloom_hashmap_lookup);
-	if (!link) {
+	if (libbpf_get_error(link)) {
 		fprintf(stderr, "failed to attach program!\n");
 		exit(1);
 	}
@@ -375,7 +375,7 @@ static void hashmap_no_bloom_setup(void)
 	populate_maps();
 
 	link = bpf_program__attach(ctx.skel->progs.bloom_hashmap_lookup);
-	if (!link) {
+	if (libbpf_get_error(link)) {
 		fprintf(stderr, "failed to attach program!\n");
 		exit(1);
 	}
-- 
2.25.1