linux-kernel - Re: [PATCH mm] mm: hugetlb: Add checks for NULL for vma returned from find_vma. find_vma may return NULL, that's why its return value is usually checked for NULL.

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Message-ID: <a402b90d-372e-2774-d2c4-ceae64c6eed2@redhat.com>
Date:   Mon, 16 Jan 2023 16:12:48 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Екатерина Есина 
        <eesina@...ralinux.ru>, Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH mm] mm: hugetlb: Add checks for NULL for vma returned from
 find_vma. find_vma may return NULL, that's why its return value is usually
 checked for NULL.

On 16.01.23 16:10, Екатерина Есина wrote:
> Sorry, I've noticed that I'd sent the patch without description and sent 
> version 2.
> Function find_vma may return NULL, that's why its return value is 
> usually checked for NULL. In this case vma and its fields also should be 
> checked before dereferencing to avoid NULL pointer dereference

Thanks, but again

What are the symptoms? How exactly does this BUG manifest?

For example, does the kernel crash, and if so, how can it be triggered?

-- 
Thanks,

David / dhildenb