Merge tag 'mm-hotfixes-stable-2024-12-07-22-39' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc fixes from Andrew Morton:
 "24 hotfixes.  17 are cc:stable.  15 are MM and 9 are non-MM.

  The usual bunch of singletons - please see the relevant changelogs for
  details"

* tag 'mm-hotfixes-stable-2024-12-07-22-39' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (24 commits)
  iio: magnetometer: yas530: use signed integer type for clamp limits
  sched/numa: fix memory leak due to the overwritten vma->numab_state
  mm/damon: fix order of arguments in damos_before_apply tracepoint
  lib: stackinit: hide never-taken branch from compiler
  mm/filemap: don't call folio_test_locked() without a reference in next_uptodate_folio()
  scatterlist: fix incorrect func name in kernel-doc
  mm: correct typo in MMAP_STATE() macro
  mm: respect mmap hint address when aligning for THP
  mm: memcg: declare do_memsw_account inline
  mm/codetag: swap tags when migrate pages
  ocfs2: update seq_file index in ocfs2_dlm_seq_next
  stackdepot: fix stack_depot_save_flags() in NMI context
  mm: open-code page_folio() in dump_page()
  mm: open-code PageTail in folio_flags() and const_folio_flags()
  mm: fix vrealloc()'s KASAN poisoning logic
  Revert "readahead: properly shorten readahead when falling back to do_page_cache_ra()"
  selftests/damon: add _damon_sysfs.py to TEST_FILES
  selftest: hugetlb_dio: fix test naming
  ocfs2: free inode when ocfs2_get_init_inode() fails
  nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry()
  ...

1 files changed, 10 insertions, 1 deletions

diff --git a/mm/gup.c b/mm/gup.c
index 746070a1d8bf..3b75e631f369 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -52,7 +52,12 @@ static inline void sanity_check_pinned_pages(struct page **pages,
 	 */
 	for (; npages; npages--, pages++) {
 		struct page *page = *pages;
-		struct folio *folio = page_folio(page);
+		struct folio *folio;
+
+		if (!page)
+			continue;
+
+		folio = page_folio(page);
 
 		if (is_zero_page(page) ||
 		    !folio_test_anon(folio))
@@ -409,6 +414,10 @@ void unpin_user_pages(struct page **pages, unsigned long npages)
 
 	sanity_check_pinned_pages(pages, npages);
 	for (i = 0; i < npages; i += nr) {
+		if (!pages[i]) {
+			nr = 1;
+			continue;
+		}
 		folio = gup_folio_next(pages, npages, i, &nr);
 		gup_put_folio(folio, nr, FOLL_PIN);
 	}