Merge tag 'mm-hotfixes-stable-2022-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull last (?) hotfixes from Andrew Morton:
 "26 hotfixes.

  8 are for issues which were introduced during this -rc cycle, 18 are
  for earlier issues, and are cc:stable"

* tag 'mm-hotfixes-stable-2022-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (26 commits)
  x86/uaccess: avoid check_object_size() in copy_from_user_nmi()
  mm/page_isolation: fix isolate_single_pageblock() isolation behavior
  mm,hwpoison: check mm when killing accessing process
  mm/hugetlb: correct demote page offset logic
  mm: prevent page_frag_alloc() from corrupting the memory
  mm: bring back update_mmu_cache() to finish_fault()
  frontswap: don't call ->init if no ops are registered
  mm/huge_memory: use pfn_to_online_page() in split_huge_pages_all()
  mm: fix madivse_pageout mishandling on non-LRU page
  powerpc/64s/radix: don't need to broadcast IPI for radix pmd collapse flush
  mm: gup: fix the fast GUP race against THP collapse
  mm: fix dereferencing possible ERR_PTR
  vmscan: check folio_test_private(), not folio_get_private()
  mm: fix VM_BUG_ON in __delete_from_swap_cache()
  tools: fix compilation after gfp_types.h split
  mm/damon/dbgfs: fix memory leak when using debugfs_lookup()
  mm/migrate_device.c: copy pte dirty bit to page
  mm/migrate_device.c: add missing flush_cache_page()
  mm/migrate_device.c: flush TLB while holding PTL
  x86/mm: disable instrumentations of mm/pgprot.c
  ...

1 files changed, 10 insertions, 4 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 4ba73f5aa8bb..a78814413ac0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4386,14 +4386,20 @@ vm_fault_t finish_fault(struct vm_fault *vmf)
 
 	vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd,
 				      vmf->address, &vmf->ptl);
-	ret = 0;
+
 	/* Re-check under ptl */
-	if (likely(!vmf_pte_changed(vmf)))
+	if (likely(!vmf_pte_changed(vmf))) {
 		do_set_pte(vmf, page, vmf->address);
-	else
+
+		/* no need to invalidate: a not-present page won't be cached */
+		update_mmu_cache(vma, vmf->address, vmf->pte);
+
+		ret = 0;
+	} else {
+		update_mmu_tlb(vma, vmf->address, vmf->pte);
 		ret = VM_FAULT_NOPAGE;
+	}
 
-	update_mmu_tlb(vma, vmf->address, vmf->pte);
 	pte_unmap_unlock(vmf->pte, vmf->ptl);
 	return ret;
 }