+ mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/rmap: synchronize lock and unlock target in anon_vma_clone
has been added to the -mm mm-unstable branch.  Its filename is
     mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Eric Kim <seohyun.kim@outlook.kr>
Subject: mm/rmap: synchronize lock and unlock target in anon_vma_clone
Date: Fri, 14 Aug 2026 15:30:51 +0900

Currently, in anon_vma_clone(), src vma's anon_vma is assigned to
active_anon_vma and is used when unlocking anon_vma after linking new
AVCs.  However, the anon_vma is locked using src->anon_vma, instead of
active_anon_vma, making the lock and unlock target inconsistent.

Use active_anon_vma for both locking and unlocking.

Link: https://lore.kernel.org/OS7PR01MB139142FE16EC63B892559D40496DA2@OS7PR01MB13914.jpnprd01.prod.outlook.com
Signed-off-by: Eric Kim <seohyun.kim@outlook.kr>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Harry Yoo <harry@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/rmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/rmap.c~mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone
+++ a/mm/rmap.c
@@ -350,7 +350,7 @@ int anon_vma_clone(struct vm_area_struct
 	 * Now link the anon_vma's back to the newly inserted AVCs.
 	 * Note that all anon_vma's share the same root.
 	 */
-	anon_vma_lock_write(src->anon_vma);
+	anon_vma_lock_write(active_anon_vma);
 	list_for_each_entry_reverse(avc, &dst->anon_vma_chain, same_vma) {
 		struct anon_vma *anon_vma = avc->anon_vma;
 
_

Patches currently in -mm which might be from seohyun.kim@outlook.kr are

mm-rmap-synchronize-lock-and-unlock-target-in-anon_vma_clone.patch