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selftests/bpf: Fix return value checks in perf_event_stackmap test 

The bpf_get_stackid() function may also return 0 on success as per UAPI BPF
helper documentation. Therefore, correct checks from 'val > 0' to 'val >= 0'
to ensure that they cover all possible success return values.

Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220408041452.933944-1-ytcoode@gmail.com
This commit is contained in:
Yuntao Wang 2022-04-08 12:14:52 +08:00 committed by Daniel Borkmann
parent 8555defe48
commit 658d87687c
1 changed files with 2 additions and 2 deletions
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4
tools/testing/selftests/bpf/progs/perf_event_stackmap.c
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@ -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);