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

From: Rusty Russell <[email-masked]>
Date: Fri, 13 Mar 2015 11:54:30 +1030

"Michael S. Tsirkin" <[email-masked]> writes:
> On Thu, Mar 12, 2015 at 11:54:10AM +1030, Rusty Russell wrote:
>> "Michael S. Tsirkin" <[email-masked]> 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 <[email-masked]>
>> 
>> I'll apply it, but it looks like a bandaid.
>
>
> Absolutely.

Applied this, too:

Signed-off-by: Rusty Russell <[email-masked]>

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);