Re: [PATCH bpf-next] selftests/bpf: don't destroy failed link
From: Song Liu <song@kernel.org>
Date: 2020-07-29 05:47:30
Also in:
bpf
On Tue, Jul 28, 2020 at 9:54 PM Andrii Nakryiko [off-list ref] 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 <redacted>
Fixes: 3573f384014f ("selftests/bpf: Test CGROUP_STORAGE behavior on shared egress + ingress")
Signed-off-by: Andrii Nakryiko <redacted>Acked-by: Song Liu <redacted> btw: maybe we can move the IS_ERR() check to bpf_link__destroy()?
quoted hunk ↗ jump to hunk
--- .../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