netdev - [PATCH bpf-next v2] selftests/bpf: Fix return value checks in perf_event

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Date:   Fri,  8 Apr 2022 12:14:52 +0800
From:   Yuntao Wang <ytcoode@...il.com>
To:     skhan@...uxfoundation.org
Cc:     andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, hengqi.chen@...il.com,
        john.fastabend@...il.com, kafai@...com, kpsingh@...nel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        netdev@...r.kernel.org, shuah@...nel.org, songliubraving@...com,
        yhs@...com, ytcoode@...il.com
Subject: [PATCH bpf-next v2] selftests/bpf: Fix return value checks in perf_event_stackmap.c

The bpf_get_stackid() function may also return 0 on success.

Correct checks from 'val > 0' to 'val >= 0' to ensure that they cover all
possible success return values.

Signed-off-by: Yuntao Wang <ytcoode@...il.com>
---
v1 -> v2: update commit message

 tools/testing/selftests/bpf/progs/perf_event_stackmap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/perf_event_stackmap.c b/tools/testing/selftests/bpf/progs/perf_event_stackmap.c
index b3fcb5274ee0..f793280a3238 100644
--- a/tools/testing/selftests/bpf/progs/perf_event_stackmap.c
+++ b/tools/testing/selftests/bpf/progs/perf_event_stackmap.c
@@ -35,10 +35,10 @@ int oncpu(void *ctx)
 	long val;
 
 	val = bpf_get_stackid(ctx, &stackmap, 0);
-	if (val > 0)
+	if (val >= 0)
 		stackid_kernel = 2;
 	val = bpf_get_stackid(ctx, &stackmap, BPF_F_USER_STACK);
-	if (val > 0)
+	if (val >= 0)
 		stackid_user = 2;
 
 	trace = bpf_map_lookup_elem(&stackdata_map, &key);
-- 
2.35.0.rc2