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>
diff --git a/mm/memory.c b/mm/memory.c
index 7e91b5f..7a3b0ad 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2539,7 +2539,7 @@
} 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 @@
pte_unmap_unlock(page_table, ptl);
out_page:
unlock_page(page);
+out_release:
page_cache_release(page);
return ret;
}