[PATCH v2 0/2] kernfs: Fix UAF in PSI polling when open file is released

[Chen Ridong]

From: Chen Ridong <chenridong@xxxxxxxxxx>

This series fixes a use-after-free issue triggered when disabling and
enabling cgroup PSI.

---
v2:
 - Add kernfs_get_active_of() to safely acquire active references for
   kernfs open files suggested by Tj.
 - Split into two patches as suggested by Greg.

Chen Ridong (2):
  kernfs: Fix UAF in polling when open file is released
  cgroup/psi: Set of->priv to NULL upon file release

 fs/kernfs/file.c       | 58 +++++++++++++++++++++++++++---------------
 kernel/cgroup/cgroup.c |  1 +
 2 files changed, 39 insertions(+), 20 deletions(-)

-- 
2.34.1