In the Linux kernel, the following vulnerability has been resolved:

quota: Fix race of dquot_scan_active() with quota deactivation

dquot_scan_active() can race with quota deactivation in
quota_release_workfn() like:

  CPU0 (quota_release_workfn)         CPU1 (dquot_scan_active)
  ==============================      ==============================
  spin_lock(&dq_list_lock);
  list_replace_init(
    &releasing_dquots, &rls_head);
    /* dquot X on rls_head,
       dq_count == 0,
       DQ_ACTIVE_B still set */
  spin_unlock(&dq_list_lock);
  synchronize_srcu(&dquot_srcu);
                                      spin_lock(&dq_list_lock);
                                      list_for_each_entry(dquot,
                                          &inuse_list, dq_inuse) {
                                        /* finds dquot X */
                                        dquot_active(X) -> true
                                        atomic_inc(&X->dq_count);
                                      }
                                      spin_unlock(&dq_list_lock);
  spin_lock(&dq_list_lock);
  dquot = list_first_entry(&rls_head);
  WARN_ON_ONCE(atomic_read(&dquot->dq_count));

The problem is not only a cosmetic one as under memory pressure the
caller of dquot_scan_active() can end up working on freed dquot.

Fix the problem by making sure the dquot is removed from releasing list
when we acquire a reference to it.

https://git.kernel.org/stable/c/2bdc80f4619411e5bd4a3ef23f51e14021ed457c

https://git.kernel.org/stable/c/61e25f664dc2a08299e07d84c85776abc2350f75

https://git.kernel.org/stable/c/6678dde265708003c2b42551af4a2e3cb05decd5

https://git.kernel.org/stable/c/82cbdb4c1ebb5ea7d7bd45c18d3483b5bd32ebc1

https://git.kernel.org/stable/c/ac8a2e0d287ebf35e5d7e51e260b4e146648ba4a

https://git.kernel.org/stable/c/e93ab401da4b2e2c1b8ef2424de2f238d51c8b2d

https://git.kernel.org/stable/c/f9438cb8c8ec3adc84b2b450a3aab0123d074c3b

https://git.kernel.org/stable/c/fdd424d7c35633ac577fd87d1b043d1b8a6cd350

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