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

If we fail to prepare an anon_vma, the {new, old}_page should be released, or they will leak. Signed-off-by: Hillf Danton <[email protected]> Reviewed-by: Andrea Arcangeli <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Johannes Weiner <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
goeke · Nov 16, 2011 · ea4039a · ea4039a
1 parent 66e13e6
commit ea4039a
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
@@ -2422,6 +2422,8 @@ static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
 	 * 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;