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mm/rmap: synchronize lock and unlock target in anon_vma_clone

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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>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Harry Yoo <harry@kernel.org>
Cc: Jann Horn <jannh@google.com>
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>
This commit is contained in:
Eric Kim 2026-08-14 15:30:51 +09:00 committed by Andrew Morton
parent 556147fc27
commit f52b3b89fa
1 changed files with 1 additions and 1 deletions
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2
mm/rmap.c
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@ -350,7 +350,7 @@ int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src,
* 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;