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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>
This commit is contained in:
Andi Kleen 2009-10-14 01:51:41 +02:00
parent e43c3afb36
commit 4779cb31c0
1 changed files with 2 additions and 1 deletions
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3
mm/memory.c
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@ -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;
}