From: Hillf Danton <dhillf@gmail.com>
Date: Tue, 15 Nov 2011 22:36:12 +0000 (-0800)
Subject: hugetlb: release pages in the error path of hugetlb_cow()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ea4039a34c4c206d015d34a49d0b00868e37db1d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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 <dhillf@gmail.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index dae27ba3be2c..bb28a5f9db8d 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -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;