linux-kernel - Re: [PATCH] hugetlb: fix null-ptr-deref in hugetlb_vma_lock

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Message-ID: <74c9d165c2e09f962467364319c2a2a4e05583a7.camel@surriel.com>
Date:   Mon, 13 Nov 2023 21:07:58 -0500
From:   Rik van Riel <riel@...riel.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Cc:     eadavis@...com, nh26223@...com,
        syzbot+6ada951e7c0f7bc8a71e@...kaller.appspotmail.com,
        syzkaller-bugs@...glegroups.com, trix@...hat.com,
        nathan@...nel.org, ndesaulniers@...gle.com, muchun.song@...ux.dev,
        akpm@...ux-foundation.org
Subject: Re: [PATCH] hugetlb: fix null-ptr-deref in hugetlb_vma_lock_write

On Mon, 2023-11-13 at 17:20 -0800, Mike Kravetz wrote:
> 
> Mask off low bit flags before checking for NULL pointer.  In
> addition,
> the reserve map only 'belongs' to the OWNER (parent in parent/child
> relationships) so also check for the OWNER flag.
> 
> Reported-by: syzbot+6ada951e7c0f7bc8a71e@...kaller.appspotmail.com
> Closes:
> https://lore.kernel.org/linux-mm/00000000000078d1e00608d7878b@google.com/
> Fixes: bf4916922c60 ("hugetlbfs: extend hugetlb_vma_lock to private
> VMAs")
> Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
> 

Reviewed-by: Rik van Riel <riel@...riel.com>

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