diff options
Diffstat (limited to 'kernel/cgroup/cgroup.c')
| -rw-r--r-- | kernel/cgroup/cgroup.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index dead36969bba..f2a77b1b45a2 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -1465,8 +1465,18 @@ static struct cgroup *current_cgns_cgroup_dfl(void) { struct css_set *cset; - cset = current->nsproxy->cgroup_ns->root_cset; - return __cset_cgroup_from_root(cset, &cgrp_dfl_root); + if (current->nsproxy) { + cset = current->nsproxy->cgroup_ns->root_cset; + return __cset_cgroup_from_root(cset, &cgrp_dfl_root); + } else { + /* + * NOTE: This function may be called from bpf_cgroup_from_id() + * on a task which has already passed exit_task_namespaces() and + * nsproxy == NULL. Fall back to cgrp_dfl_root which will make all + * cgroups visible for lookups. + */ + return &cgrp_dfl_root.cgrp; + } } /* look up cgroup associated with given css_set on the specified hierarchy */ @@ -6856,14 +6866,12 @@ EXPORT_SYMBOL_GPL(cgroup_get_from_path); struct cgroup *cgroup_v1v2_get_from_fd(int fd) { struct cgroup *cgrp; - struct file *f; - - f = fget_raw(fd); - if (!f) + struct fd f = fdget_raw(fd); + if (!f.file) return ERR_PTR(-EBADF); - cgrp = cgroup_v1v2_get_from_file(f); - fput(f); + cgrp = cgroup_v1v2_get_from_file(f.file); + fdput(f); return cgrp; } |