diff options
| -rw-r--r-- | kernel/bpf/trampoline.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c index 84db9e658e52..f02254a21585 100644 --- a/kernel/bpf/trampoline.c +++ b/kernel/bpf/trampoline.c @@ -1002,10 +1002,8 @@ int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog, mutex_lock(&tr->mutex); shim_link = cgroup_shim_find(tr, bpf_func); - if (shim_link) { + if (shim_link && !IS_ERR(bpf_link_inc_not_zero(&shim_link->link.link))) { /* Reusing existing shim attached by the other program. */ - bpf_link_inc(&shim_link->link.link); - mutex_unlock(&tr->mutex); bpf_trampoline_put(tr); /* bpf_trampoline_get above */ return 0; |