* [PATCH bpf-next] selftests/bpf: don't destroy failed link
@ 2020-07-29 4:50 Andrii Nakryiko
2020-07-29 5:30 ` YiFei Zhu
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Andrii Nakryiko @ 2020-07-29 4:50 UTC (permalink / raw)
To: bpf, netdev, ast, daniel
Cc: andrii.nakryiko, kernel-team, Andrii Nakryiko, YiFei Zhu
Check that link is NULL or proper pointer before invoking bpf_link__destroy().
Not doing this causes crash in test_progs, when cg_storage_multi selftest
fails.
Cc: YiFei Zhu <zhuyifei@google.com>
Fixes: 3573f384014f ("selftests/bpf: Test CGROUP_STORAGE behavior on shared egress + ingress")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
.../bpf/prog_tests/cg_storage_multi.c | 42 ++++++++++++-------
1 file changed, 28 insertions(+), 14 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/cg_storage_multi.c b/tools/testing/selftests/bpf/prog_tests/cg_storage_multi.c
index c67d8c076a34..643dfa35419c 100644
--- a/tools/testing/selftests/bpf/prog_tests/cg_storage_multi.c
+++ b/tools/testing/selftests/bpf/prog_tests/cg_storage_multi.c
@@ -147,8 +147,10 @@ static void test_egress_only(int parent_cgroup_fd, int child_cgroup_fd)
goto close_bpf_object;
close_bpf_object:
- bpf_link__destroy(parent_link);
- bpf_link__destroy(child_link);
+ if (!IS_ERR(parent_link))
+ bpf_link__destroy(parent_link);
+ if (!IS_ERR(child_link))
+ bpf_link__destroy(child_link);
cg_storage_multi_egress_only__destroy(obj);
}
@@ -262,12 +264,18 @@ static void test_isolated(int parent_cgroup_fd, int child_cgroup_fd)
goto close_bpf_object;
close_bpf_object:
- bpf_link__destroy(parent_egress1_link);
- bpf_link__destroy(parent_egress2_link);
- bpf_link__destroy(parent_ingress_link);
- bpf_link__destroy(child_egress1_link);
- bpf_link__destroy(child_egress2_link);
- bpf_link__destroy(child_ingress_link);
+ if (!IS_ERR(parent_egress1_link))
+ bpf_link__destroy(parent_egress1_link);
+ if (!IS_ERR(parent_egress2_link))
+ bpf_link__destroy(parent_egress2_link);
+ if (!IS_ERR(parent_ingress_link))
+ bpf_link__destroy(parent_ingress_link);
+ if (!IS_ERR(child_egress1_link))
+ bpf_link__destroy(child_egress1_link);
+ if (!IS_ERR(child_egress2_link))
+ bpf_link__destroy(child_egress2_link);
+ if (!IS_ERR(child_ingress_link))
+ bpf_link__destroy(child_ingress_link);
cg_storage_multi_isolated__destroy(obj);
}
@@ -367,12 +375,18 @@ static void test_shared(int parent_cgroup_fd, int child_cgroup_fd)
goto close_bpf_object;
close_bpf_object:
- bpf_link__destroy(parent_egress1_link);
- bpf_link__destroy(parent_egress2_link);
- bpf_link__destroy(parent_ingress_link);
- bpf_link__destroy(child_egress1_link);
- bpf_link__destroy(child_egress2_link);
- bpf_link__destroy(child_ingress_link);
+ if (!IS_ERR(parent_egress1_link))
+ bpf_link__destroy(parent_egress1_link);
+ if (!IS_ERR(parent_egress2_link))
+ bpf_link__destroy(parent_egress2_link);
+ if (!IS_ERR(parent_ingress_link))
+ bpf_link__destroy(parent_ingress_link);
+ if (!IS_ERR(child_egress1_link))
+ bpf_link__destroy(child_egress1_link);
+ if (!IS_ERR(child_egress2_link))
+ bpf_link__destroy(child_egress2_link);
+ if (!IS_ERR(child_ingress_link))
+ bpf_link__destroy(child_ingress_link);
cg_storage_multi_shared__destroy(obj);
}
--
2.24.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH bpf-next] selftests/bpf: don't destroy failed link
2020-07-29 4:50 [PATCH bpf-next] selftests/bpf: don't destroy failed link Andrii Nakryiko
@ 2020-07-29 5:30 ` YiFei Zhu
2020-07-29 5:47 ` Song Liu
2020-07-29 23:12 ` Daniel Borkmann
2 siblings, 0 replies; 5+ messages in thread
From: YiFei Zhu @ 2020-07-29 5:30 UTC (permalink / raw)
To: Andrii Nakryiko
Cc: bpf, netdev, ast, Daniel Borkmann, Andrii Nakryiko, kernel-team
On Tue, Jul 28, 2020 at 11:51 PM Andrii Nakryiko <andriin@fb.com> wrote:
>
> Check that link is NULL or proper pointer before invoking bpf_link__destroy().
> Not doing this causes crash in test_progs, when cg_storage_multi selftest
> fails.
>
> Cc: YiFei Zhu <zhuyifei@google.com>
> Fixes: 3573f384014f ("selftests/bpf: Test CGROUP_STORAGE behavior on shared egress + ingress")
> Signed-off-by: Andrii Nakryiko <andriin@fb.com>
> ---
> .../bpf/prog_tests/cg_storage_multi.c | 42 ++++++++++++-------
> 1 file changed, 28 insertions(+), 14 deletions(-)
>
Awesome! Thanks for the fix. I did not realize the return was a -errno
rather than NULL like open_and_load.
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH bpf-next] selftests/bpf: don't destroy failed link
2020-07-29 4:50 [PATCH bpf-next] selftests/bpf: don't destroy failed link Andrii Nakryiko
2020-07-29 5:30 ` YiFei Zhu
@ 2020-07-29 5:47 ` Song Liu
2020-07-29 6:16 ` Andrii Nakryiko
2020-07-29 23:12 ` Daniel Borkmann
2 siblings, 1 reply; 5+ messages in thread
From: Song Liu @ 2020-07-29 5:47 UTC (permalink / raw)
To: Andrii Nakryiko
Cc: bpf, Networking, Alexei Starovoitov, Daniel Borkmann,
Andrii Nakryiko, Kernel Team, YiFei Zhu
On Tue, Jul 28, 2020 at 9:54 PM Andrii Nakryiko <andriin@fb.com> wrote:
>
> Check that link is NULL or proper pointer before invoking bpf_link__destroy().
> Not doing this causes crash in test_progs, when cg_storage_multi selftest
> fails.
>
> Cc: YiFei Zhu <zhuyifei@google.com>
> Fixes: 3573f384014f ("selftests/bpf: Test CGROUP_STORAGE behavior on shared egress + ingress")
> Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
btw: maybe we can move the IS_ERR() check to bpf_link__destroy()?
> ---
> .../bpf/prog_tests/cg_storage_multi.c | 42 ++++++++++++-------
> 1 file changed, 28 insertions(+), 14 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/cg_storage_multi.c b/tools/testing/selftests/bpf/prog_tests/cg_storage_multi.c
> index c67d8c076a34..643dfa35419c 100644
> --- a/tools/testing/selftests/bpf/prog_tests/cg_storage_multi.c
> +++ b/tools/testing/selftests/bpf/prog_tests/cg_storage_multi.c
> @@ -147,8 +147,10 @@ static void test_egress_only(int parent_cgroup_fd, int child_cgroup_fd)
> goto close_bpf_object;
>
> close_bpf_object:
> - bpf_link__destroy(parent_link);
> - bpf_link__destroy(child_link);
> + if (!IS_ERR(parent_link))
> + bpf_link__destroy(parent_link);
> + if (!IS_ERR(child_link))
> + bpf_link__destroy(child_link);
>
> cg_storage_multi_egress_only__destroy(obj);
> }
> @@ -262,12 +264,18 @@ static void test_isolated(int parent_cgroup_fd, int child_cgroup_fd)
> goto close_bpf_object;
>
> close_bpf_object:
> - bpf_link__destroy(parent_egress1_link);
> - bpf_link__destroy(parent_egress2_link);
> - bpf_link__destroy(parent_ingress_link);
> - bpf_link__destroy(child_egress1_link);
> - bpf_link__destroy(child_egress2_link);
> - bpf_link__destroy(child_ingress_link);
> + if (!IS_ERR(parent_egress1_link))
> + bpf_link__destroy(parent_egress1_link);
> + if (!IS_ERR(parent_egress2_link))
> + bpf_link__destroy(parent_egress2_link);
> + if (!IS_ERR(parent_ingress_link))
> + bpf_link__destroy(parent_ingress_link);
> + if (!IS_ERR(child_egress1_link))
> + bpf_link__destroy(child_egress1_link);
> + if (!IS_ERR(child_egress2_link))
> + bpf_link__destroy(child_egress2_link);
> + if (!IS_ERR(child_ingress_link))
> + bpf_link__destroy(child_ingress_link);
>
> cg_storage_multi_isolated__destroy(obj);
> }
> @@ -367,12 +375,18 @@ static void test_shared(int parent_cgroup_fd, int child_cgroup_fd)
> goto close_bpf_object;
>
> close_bpf_object:
> - bpf_link__destroy(parent_egress1_link);
> - bpf_link__destroy(parent_egress2_link);
> - bpf_link__destroy(parent_ingress_link);
> - bpf_link__destroy(child_egress1_link);
> - bpf_link__destroy(child_egress2_link);
> - bpf_link__destroy(child_ingress_link);
> + if (!IS_ERR(parent_egress1_link))
> + bpf_link__destroy(parent_egress1_link);
> + if (!IS_ERR(parent_egress2_link))
> + bpf_link__destroy(parent_egress2_link);
> + if (!IS_ERR(parent_ingress_link))
> + bpf_link__destroy(parent_ingress_link);
> + if (!IS_ERR(child_egress1_link))
> + bpf_link__destroy(child_egress1_link);
> + if (!IS_ERR(child_egress2_link))
> + bpf_link__destroy(child_egress2_link);
> + if (!IS_ERR(child_ingress_link))
> + bpf_link__destroy(child_ingress_link);
>
> cg_storage_multi_shared__destroy(obj);
> }
> --
> 2.24.1
>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH bpf-next] selftests/bpf: don't destroy failed link
2020-07-29 5:47 ` Song Liu
@ 2020-07-29 6:16 ` Andrii Nakryiko
0 siblings, 0 replies; 5+ messages in thread
From: Andrii Nakryiko @ 2020-07-29 6:16 UTC (permalink / raw)
To: Song Liu
Cc: Andrii Nakryiko, bpf, Networking, Alexei Starovoitov,
Daniel Borkmann, Kernel Team, YiFei Zhu
On Tue, Jul 28, 2020 at 10:47 PM Song Liu <song@kernel.org> wrote:
>
> On Tue, Jul 28, 2020 at 9:54 PM Andrii Nakryiko <andriin@fb.com> wrote:
> >
> > Check that link is NULL or proper pointer before invoking bpf_link__destroy().
> > Not doing this causes crash in test_progs, when cg_storage_multi selftest
> > fails.
> >
> > Cc: YiFei Zhu <zhuyifei@google.com>
> > Fixes: 3573f384014f ("selftests/bpf: Test CGROUP_STORAGE behavior on shared egress + ingress")
> > Signed-off-by: Andrii Nakryiko <andriin@fb.com>
>
> Acked-by: Song Liu <songliubraving@fb.com>
>
> btw: maybe we can move the IS_ERR() check to bpf_link__destroy()?
Yeah, given how common this mistake seems to be, that wouldn't be a bad idea.
>
> > ---
> > .../bpf/prog_tests/cg_storage_multi.c | 42 ++++++++++++-------
> > 1 file changed, 28 insertions(+), 14 deletions(-)
> >
[...]
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH bpf-next] selftests/bpf: don't destroy failed link
2020-07-29 4:50 [PATCH bpf-next] selftests/bpf: don't destroy failed link Andrii Nakryiko
2020-07-29 5:30 ` YiFei Zhu
2020-07-29 5:47 ` Song Liu
@ 2020-07-29 23:12 ` Daniel Borkmann
2 siblings, 0 replies; 5+ messages in thread
From: Daniel Borkmann @ 2020-07-29 23:12 UTC (permalink / raw)
To: Andrii Nakryiko, bpf, netdev, ast; +Cc: andrii.nakryiko, kernel-team, YiFei Zhu
On 7/29/20 6:50 AM, Andrii Nakryiko wrote:
> Check that link is NULL or proper pointer before invoking bpf_link__destroy().
> Not doing this causes crash in test_progs, when cg_storage_multi selftest
> fails.
>
> Cc: YiFei Zhu <zhuyifei@google.com>
> Fixes: 3573f384014f ("selftests/bpf: Test CGROUP_STORAGE behavior on shared egress + ingress")
> Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Applied, thanks!
^ permalink raw reply [flat|nested] 5+ messages in thread
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2020-07-29 4:50 [PATCH bpf-next] selftests/bpf: don't destroy failed link Andrii Nakryiko
2020-07-29 5:30 ` YiFei Zhu
2020-07-29 5:47 ` Song Liu
2020-07-29 6:16 ` Andrii Nakryiko
2020-07-29 23:12 ` Daniel Borkmann
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