linux-kernel - Re: [PATCH] mm/huge_memory: Fix to make vma_adjust_trans_huge() use find

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Message-ID: <Zz9ZfGy2veK0zGW0@casper.infradead.org>
Date: Thu, 21 Nov 2024 16:02:04 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Jeongjun Park <aha310510@...il.com>
Cc: akpm@...ux-foundation.org, dave@...olabs.net, Liam.Howlett@...cle.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] mm/huge_memory: Fix to make vma_adjust_trans_huge() use
 find_vma() correctly

On Thu, Nov 21, 2024 at 09:41:13PM +0900, Jeongjun Park wrote:
> vma_adjust_trans_huge() uses find_vma() to get the VMA, but find_vma() uses
> the returned pointer without any verification, even though it may return NULL.
> In this case, NULL pointer dereference may occur, so to prevent this,
> vma_adjust_trans_huge() should be fix to verify the return value of find_vma().

I don't think we should change anything here.