cgroup: fix use-after-free when umounting cgroupfs

Try:
  # mount -t cgroup xxx /cgroup
  # mkdir /cgroup/sub && rmdir /cgroup/sub && umount /cgroup

And you might see this:

ida_remove called for id=1 which is not allocated.

It's because cgroup_kill_sb() is called to destroy root->cgroup_ida
and free cgrp->root before ida_simple_removed() is called. What's
worse is we're accessing cgrp->root while it has been freed.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 192d762..bd4de46 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -848,9 +848,12 @@ static void cgroup_free_fn(struct work_struct *work)
         */
        dput(cgrp->parent->dentry);
 
+       ida_simple_remove(&cgrp->root->cgroup_ida, cgrp->id);
+
        /*
         * Drop the active superblock reference that we took when we
-        * created the cgroup
+        * created the cgroup. This will free cgrp->root, if we are
+        * holding the last reference to @sb.
         */
        deactivate_super(cgrp->root->sb);
 
@@ -862,7 +865,6 @@ static void cgroup_free_fn(struct work_struct *work)
 
        simple_xattrs_free(&cgrp->xattrs);
 
-       ida_simple_remove(&cgrp->root->cgroup_ida, cgrp->id);
        kfree(rcu_dereference_raw(cgrp->name));
        kfree(cgrp);
 }