From: Andrea Parri <parri.andrea@gmail.com>
To: Wei Liu <wei.liu@kernel.org>
Cc: linux-kernel@vger.kernel.org,
"K . Y . Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
linux-hyperv@vger.kernel.org,
Michael Kelley <mikelley@microsoft.com>,
Juan Vazquez <juvazq@microsoft.com>,
Saruhan Karademir <skarade@microsoft.com>
Subject: Re: [PATCH 4/6] Drivers: hv: vmbus: Avoid use-after-free in vmbus_onoffer_rescind()
Date: Tue, 24 Nov 2020 20:54:07 +0100 [thread overview]
Message-ID: <20201124195407.GA16042@andrea> (raw)
In-Reply-To: <20201124162633.n7zlpte6f7zfhn6z@liuwe-devbox-debian-v2>
On Tue, Nov 24, 2020 at 04:26:33PM +0000, Wei Liu wrote:
> On Wed, Nov 18, 2020 at 03:36:47PM +0100, Andrea Parri (Microsoft) wrote:
> > When channel->device_obj is non-NULL, vmbus_onoffer_rescind() could
> > invoke put_device(), that will eventually release the device and free
> > the channel object (cf. vmbus_device_release()). However, a pointer
> > to the object is dereferenced again later to load the primary_channel.
> > The use-after-free can be avoided by noticing that this load/check is
> > redundant if device_obk is non-NULL: primary_channel must be NULL if
>
> device_obk -> device_obj
Fixed.
>
> > device_obj is non-NULL, cf. vmbus_add_channel_work().
> >
>
> Missing a Fixes tag?
Yes, I've added the tag.
Thanks,
Andrea
next prev parent reply other threads:[~2020-11-24 19:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-18 14:36 [PATCH 0/6] Drivers: hv: vmbus: More VMBus-hardening changes Andrea Parri (Microsoft)
2020-11-18 14:36 ` [PATCH 1/6] Drivers: hv: vmbus: Initialize memory to be sent to the host Andrea Parri (Microsoft)
2020-12-06 16:59 ` Michael Kelley
2020-12-06 17:54 ` Andrea Parri
2020-11-18 14:36 ` [PATCH 2/6] Drivers: hv: vmbus: Avoid double fetch of msgtype in vmbus_on_msg_dpc() Andrea Parri (Microsoft)
2020-12-06 17:10 ` Michael Kelley
2020-12-06 18:05 ` Andrea Parri
2020-11-18 14:36 ` [PATCH 3/6] Drivers: hv: vmbus: Avoid double fetch of payload_size " Andrea Parri (Microsoft)
2020-12-06 17:14 ` Michael Kelley
2020-12-06 18:20 ` Andrea Parri
2020-11-18 14:36 ` [PATCH 4/6] Drivers: hv: vmbus: Avoid use-after-free in vmbus_onoffer_rescind() Andrea Parri (Microsoft)
2020-11-24 16:26 ` Wei Liu
2020-11-24 19:54 ` Andrea Parri [this message]
2020-12-06 17:23 ` Michael Kelley
2020-11-18 14:36 ` [PATCH 5/6] Drivers: hv: vmbus: Resolve race condition " Andrea Parri (Microsoft)
2020-11-18 14:36 ` [PATCH 6/6] Drivers: hv: vmbus: Do not allow overwriting vmbus_connection.channels[] Andrea Parri (Microsoft)
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