Re: [PATCH] vsock/virtio: fix kernel panic from virtio_transport_reset_no_sock

["Adalbert Lazăr" <alazar@bitdefender.com>]

On Wed, 6 Mar 2019 17:02:16 +0000, Stefan Hajnoczi <stefanha@redhat.com> wrote:
> On Wed, Mar 06, 2019 at 11:10:41AM +0200, Adalbert Lazăr wrote:
> > On Wed, 6 Mar 2019 08:41:04 +0000, Stefan Hajnoczi <stefanha@gmail.com> wrote:
> > > On Tue, Mar 05, 2019 at 08:01:45PM +0200, Adalbert Lazăr wrote:
> > > The pkt argument is the received packet that we must reply to.
> > > The reply packet is allocated just before line 680 and must be free
> > > explicitly for return -ENOTCONN.
> > > 
> > > You can avoid the leak and make the code easier to read like this:
> > > 
> > >   struct virtio_vsock_pkt *reply;
> > > 
> > >   ...
> > > 
> > >      ------ avoid reusing 'pkt'
> > >     v
> > >   reply = virtio_transport_alloc_pkt(&info, 0, ...);
> > >   if (!reply)
> > >       return -ENOMEM;
> > > 
> > >   t = virtio_transport_get_ops();
> > >   if (!t) {
> > >       virtio_transport_free_pkt(reply); <-- prevent memory leak
> > >       return -ENOTCONN;
> > >   }
> > >   return t->send_pkt(reply);
> > 
> > What do you think about Stefano's suggestion, to move the check above
> > the line were the reply is allocated?
> 
> That's fine too.
> 
> However a follow up patch to eliminate the confusing way that 'pkt' is
> reused is still warranted.  If you are busy I'd be happy to send that
> cleanup.
> 
> Stefan

I've got it, a couple of minutes after I've replied :)
The second version[1] should be in your mailbox.

Thank you,
Adalbert

[1]: https://patchwork.kernel.org/patch/10840787/
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