HWPOISON: Fix page count leak in hwpoison late kill in do_swap_page

When returning due to a poisoned page drop the page count.

It wasn't a fatal problem because noone cares about the page count
on a poisoned page (except when it wraps), but it's cleaner to fix it.

Pointed out by Linus.

Signed-off-by: Andi Kleen <ak@linux.intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/mm/memory.c b/mm/memory.c
index 7e91b5f9f690..7a3b0ad5594a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2539,7 +2539,7 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
         } else if (PageHWPoison(page)) {
                 ret = VM_FAULT_HWPOISON;
                 delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
-                goto out;
+                goto out_release;
         }
 
         lock_page(page);
@@ -2611,6 +2611,7 @@ out_nomap:
         pte_unmap_unlock(page_table, ptl);
 out_page:
         unlock_page(page);
+out_release:
         page_cache_release(page);
         return ret;
 }