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cgroup: fix error handling regressions in proc_cgroup_show() and cgroup_release_agent()

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4c737b41de ("cgroup: make cgroup_path() and friends behave in the
style of strlcpy()") broke error handling in proc_cgroup_show() and
cgroup_release_agent() by not handling negative return values from
cgroup_path_ns_locked().  Fix it.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2016-09-29 15:49:40 +02:00
parent 679a5e3f12
commit e0223003e6
1 changed files with 3 additions and 3 deletions
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6
kernel/cgroup.c
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@ -5781,10 +5781,10 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
if (cgroup_on_dfl(cgrp) || !(tsk->flags & PF_EXITING)) {
retval = cgroup_path_ns_locked(cgrp, buf, PATH_MAX,
current->nsproxy->cgroup_ns);
if (retval >= PATH_MAX) {
if (retval >= PATH_MAX)
retval = -ENAMETOOLONG;
if (retval < 0)
goto out_unlock;
}
seq_puts(m, buf);
} else {
@ -6069,7 +6069,7 @@ static void cgroup_release_agent(struct work_struct *work)
spin_lock_irq(&css_set_lock);
ret = cgroup_path_ns_locked(cgrp, pathbuf, PATH_MAX, &init_cgroup_ns);
spin_unlock_irq(&css_set_lock);
if (ret >= PATH_MAX)
if (ret < 0 || ret >= PATH_MAX)
goto out;
argv[0] = agentbuf;