[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20230130195713.2881766-1-Liam.Howlett@oracle.com>
Date: Mon, 30 Jan 2023 14:57:13 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: maple-tree@...ts.infradead.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
linux-next@...r.kernel.org
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>,
Sanan Hasanov <sanan.hasanov@...ghts.ucf.edu>,
Matthew Wilcox <willy@...radead.org>,
David Hildenbrand <david@...hat.com>,
Hugh Dickins <hughd@...gle.com>
Subject: [PATCH] mm/mmap: Fix vma_merge() offset when expanding the next vma
The vm_pgoff was being set incorrectly when expanding the next VMA to a
lower address. Fix the issue by using the mid->vm_pgoff value for this
merge case (aka case 8). Note that this does not change case 3's
vm_pgoff as next and mid are the same VMA.
Reported-by: Sanan Hasanov <sanan.hasanov@...ghts.ucf.edu>
Link: https://lore.kernel.org/linux-mm/IA1PR07MB983017D2FBA174D2FF78CEB6ABCE9@IA1PR07MB9830.namprd07.prod.outlook.com/
Cc: Matthew Wilcox <willy@...radead.org>
Cc: David Hildenbrand <david@...hat.com>
Cc: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
mm/mmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 00d90bbc250e..614ea2d93b0a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -978,7 +978,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
vma = next; /* case 3 */
vma_start = addr;
vma_end = next->vm_end;
- vma_pgoff = next->vm_pgoff;
+ vma_pgoff = mid->vm_pgoff;
err = 0;
if (mid != next) { /* case 8 */
remove = mid;
--
2.39.0
Powered by blists - more mailing lists