netdev - Re: [PATCH] 9p/trans_virtio: fix hot-unplug

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Message-ID: <8761a5wuy9.fsf@rustcorp.com.au>
Date:	Fri, 13 Mar 2015 11:54:30 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Eric Van Hensbergen <ericvh@...il.com>,
	Ron Minnich <rminnich@...dia.gov>,
	Latchesar Ionkov <lucho@...kov.net>,
	"David S. Miller" <davem@...emloft.net>,
	v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [PATCH] 9p/trans_virtio: fix hot-unplug

"Michael S. Tsirkin" <mst@...hat.com> writes:
> On Thu, Mar 12, 2015 at 11:54:10AM +1030, Rusty Russell wrote:
>> "Michael S. Tsirkin" <mst@...hat.com> writes:
>> > On device hot-unplug, 9p/virtio currently will kfree channel while
>> > it might still be in use.
>> >
>> > Of course, it might stay used forever, so it's an extremely ugly hack,
>> > but it seems better than use-after-free that we have now.
>> >
>> > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
>> 
>> I'll apply it, but it looks like a bandaid.
>
>
> Absolutely.

Applied this, too:


Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 73fab71397ce..781315d97ed5 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -659,7 +659,6 @@ static void p9_virtio_remove(struct virtio_device *vdev)
 {
 	struct virtio_chan *chan = vdev->priv;
 	unsigned long warning_time;
-	bool inuse;
 
 	mutex_lock(&virtio_9p_lock);
 
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