[PATCH 2/6] mm: swap: use correct step in loop to wait all clusters in wait_for_allocation()

[Kemeng Shi <shikemeng@huaweicloud.com>]

Use correct step in loop to wait all clusters in wait_for_allocation().
If we miss some cluster in wait_for_allocation(), use after free may
occurs as following:
shmem_writepage                  swapoff
 folio_alloc_swap
  get_swap_pages
   scan_swap_map_slots
    cluster_alloc_swap_entry
     alloc_swap_scan_cluster
      cluster_alloc_range
       /* SWP_WRITEOK is valid */
       if (!(si->flags & SWP_WRITEOK))

                                  ...
                                  del_from_avail_list(p, true);
                                  ...
                                  /* miss the cluster in shmem_writepage */
                                  wait_for_allocation()
                                  ...
                                  try_to_unuse()

       memset(si->swap_map + start, usage, nr_pages);
       swap_range_alloc(si, nr_pages);
       ci->count += nr_pages;
       /* return a valid entry */

                                  ...
                                  exit_swap_address_space(p->type);
                                  ...

 ...
 add_to_swap_cache
  /* dereference swap_address_space(entry) which is NULL */
  xas_lock_irq(&xas);

Fixes: e47bd46eab97e ("mm, swap: hold a reference during scan and cleanup flag usage")
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
---
 mm/swapfile.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index e5f58ab86329..425126c0a07d 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2627,7 +2627,6 @@ static void wait_for_allocation(struct swap_info_struct *si)
 	for (offset = 0; offset < end; offset += SWAPFILE_CLUSTER) {
 		ci = lock_cluster(si, offset);
 		unlock_cluster(ci);
-		offset += SWAPFILE_CLUSTER;
 	}
 }
 
-- 
2.30.0