linux-kernel - Re: [PATCH] ntfs3: Fix attr_punch_hole() null pointer derenference

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Message-ID: <Y80+MZLA2sXyYf2J@kroah.com>
Date:   Sun, 22 Jan 2023 14:46:25 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     SeongJae Park <sj@...nel.org>
Cc:     Alon Zahavi <zahavi.alon@...il.com>,
        almaz.alexandrovich@...agon-software.com, ntfs3@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Tal Lossos <tallossos@...il.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] ntfs3: Fix attr_punch_hole() null pointer derenference

On Tue, Jan 17, 2023 at 08:21:36PM +0000, SeongJae Park wrote:
> Hello,
> 
> On Mon, 15 Aug 2022 14:07:12 +0300 Alon Zahavi <zahavi.alon@...il.com> wrote:
> 
> > From: Alon Zahavi <zahavi.alon@...il.com>
> > 
> > The bug occours due to a misuse of `attr` variable instead of `attr_b`.
> > `attr` is being initialized as NULL, then being derenfernced
> > as `attr->res.data_size`.
> > 
> > This bug causes a crash of the ntfs3 driver itself,
> > If compiled directly to the kernel, it crashes the whole system.
> > 
> > Signed-off-by: Alon Zahavi <zahavi.alon@...il.com>
> > Co-developed-by: Tal Lossos <tallossos@...il.com>
> > Signed-off-by: Tal Lossos <tallossos@...il.com>
> 
> This patch has now merged in mainline as
> 6d5c9e79b726cc473d40e9cb60976dbe8e669624.  stable@, could you please merge this
> in stable kernels?
> 
> Fixes: be71b5cba2e64 ("fs/ntfs3: Add attrib operations") # 5.14
> 

Now queued up, thanks.

greg k-h