Merge tag 'edac_urgent_for_5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras

Pull EDAC fix from Borislav Petkov:
 "Fix ghes_edac UAF case triggered by KASAN and DEBUG_TEST_DRIVER_REMOVE.

  Future pending rework of the ghes_edac instances registration will do
  away with the single memory controller per system model and that ugly
  hackery there.

  This is a minimal fix for stable@, courtesy of James Morse"

* tag 'edac_urgent_for_5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras:
  EDAC/ghes: Fix Use after free in ghes_edac remove path

drivers/edac/ghes_edac.c

@@ -553,7 +553,11 @@ void ghes_edac_unregister(struct ghes *ghes)
 	if (!ghes_pvt)
 		return;
 
+	if (atomic_dec_return(&ghes_init))
+		return;
+
 	mci = ghes_pvt->mci;
+	ghes_pvt = NULL;
 	edac_mc_del_mc(mci->pdev);
 	edac_mc_free(mci);
 }