From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Alexander Usyskin <alexander.usyskin@intel.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
Tomas Winkler <tomas.winkler@intel.com>,
Vitaly Lubart <vitaly.lubart@intel.com>,
Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Subject: Re: [PATCH] mtd: fix use-after-free in mtd release
Date: Thu, 27 Jul 2023 18:12:04 +0300 [thread overview]
Message-ID: <ZMKJRNDoQV8p0DH4@smile.fi.intel.com> (raw)
In-Reply-To: <20230727145758.3880967-1-alexander.usyskin@intel.com>
On Thu, Jul 27, 2023 at 05:57:58PM +0300, Alexander Usyskin wrote:
> I case of partition device_unregister in mtd_device_release
In
device_unregister()
mtd_device_release()
> calls mtd_release which frees mtd_info structure for partition.
mtd_release()
> All code after device_unregister in mtd_device_release thus
device_unregister()
mtd_device_release()
> works already freed memory.
uses?
> Move part of code to mtd_release and restict mtd->dev cleanup
mtd_release()
> to non-partion object.
> For partition object such cleanup have no sense as partition
> mtd_info is removed.
>
> Cc: Miquel Raynal <miquel.raynal@bootlin.com>
> Cc: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
> Fixes: 19bfa9ebebb5 ("mtd: use refcount to prevent corruption")
Closes: ?
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2023-07-27 15:12 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-27 14:57 [PATCH] mtd: fix use-after-free in mtd release Alexander Usyskin
2023-07-27 15:12 ` Andy Shevchenko [this message]
2023-07-27 15:20 ` Miquel Raynal
2023-07-27 15:58 ` Andy Shevchenko
2023-07-27 16:36 ` Miquel Raynal
2023-07-30 11:10 ` Usyskin, Alexander
2023-07-31 1:35 ` zhangxiaoxu (A)
2023-08-02 12:44 ` Miquel Raynal
2023-08-03 12:06 ` huaweicloud
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