Unverified Commit e9ed7f86 authored Mar 27, 2024 by openeuler-ci-bot Committed by Gitee Mar 27, 2024

!5553 mm: ksm: fix use-after-free kasan report in ksm_might_need_to_copy

Merge Pull Request from: @ci-robot 
 
PR sync from: Jinjiang Tu <tujinjiang@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/AMCC2XCIFJC2N5WRSUJS2OKGK4RVPGV6/ 
 
https://gitee.com/openeuler/kernel/issues/I9BWES 
 
Link:https://gitee.com/openeuler/kernel/pulls/5553

 

Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>

parents 1d1e27a9 5db09afe

mm/ksm.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -2727,8 +2727,8 @@ struct page ksm_might_need_to_copy(struct page page,
		return page; /* no need to copy it */
		} else if (!anon_vma) {
		return page; /* no need to copy it */
		} else if (anon_vma->root == vma->anon_vma->root &&
		page->index == linear_page_index(vma, address)) {
		} else if (page->index == linear_page_index(vma, address) &&
		anon_vma->root == vma->anon_vma->root) {
		return page; /* still no need to copy it */
		}
		if (!PageUptodate(page))