From: Liu Ye <liuye@kylinos.cn>
To: akpm@linux-foundation.org, Liam.Howlett@oracle.com,
lorenzo.stoakes@oracle.com
Cc: jannh@google.com, vbabka@suse.cz, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Liu Ye <liuye@kylinos.cn>
Subject: [PATCH] mm/vma: Add VM_WARN_ON for commit_merge
Date: Thu, 16 Jan 2025 10:50:05 +0800 [thread overview]
Message-ID: <20250116025005.55846-1-liuye@kylinos.cn> (raw)
Add VM_WARN_ON to prevent 'adjust' from accessing NULL pointers
when 'adjust' is NULL and 'expanded' is false or 'adj_start' is
not zero.
Signed-off-by: Liu Ye <liuye@kylinos.cn>
---
mm/vma.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/vma.c b/mm/vma.c
index 31c9c6f51c9f..36b5ac675504 100644
--- a/mm/vma.c
+++ b/mm/vma.c
@@ -641,6 +641,7 @@ static int commit_merge(struct vma_merge_struct *vmg,
init_multi_vma_prep(&vp, vmg->vma, adjust, remove, remove2);
+ VM_WARN_ON(!adjust && (!expanded || adj_start));
VM_WARN_ON(vp.anon_vma && adjust && adjust->anon_vma &&
vp.anon_vma != adjust->anon_vma);
--
2.25.1
next reply other threads:[~2025-01-16 2:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-16 2:50 Liu Ye [this message]
2025-01-16 4:01 ` Andrew Morton
2025-01-16 6:06 ` liuye
2025-01-16 7:44 ` Lorenzo Stoakes
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