On Tue, Jul 28, 2020 at 11:51 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>
---
 .../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.