[PATCH] hugetlb: release pages in the error path of hugetlb_cow()

[Hillf Danton]

If fail to prepare anon_vma, {new, old}_page should be released, or they will
escape the track and/or control of memory management.

Thanks

Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---

--- a/mm/hugetlb.c	Fri Nov 11 20:36:32 2011
+++ b/mm/hugetlb.c	Fri Nov 11 20:43:06 2011
@@ -2422,6 +2422,8 @@ retry_avoidcopy:
 	 * anon_vma prepared.
 	 */
 	if (unlikely(anon_vma_prepare(vma))) {
+		page_cache_release(new_page);
+		page_cache_release(old_page);
 		/* Caller expects lock to be held */
 		spin_lock(&mm->page_table_lock);
 		return VM_FAULT_OOM;
--
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