linux-kernel - RE: [PATCH] vdpa_sim: avoid putting an uninitialized iova

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Message-ID: <690da6f45a364dbbaea38d393762c6fc@huawei.com>
Date:   Tue, 23 Nov 2021 06:12:17 +0000
From:   "Longpeng (Mike, Cloud Infrastructure Service Product Dept.)" 
        <longpeng2@...wei.com>
To:     Jason Wang <jasowang@...hat.com>, Parav Pandit <parav@...dia.com>
CC:     "mst@...hat.com" <mst@...hat.com>,
        "sgarzare@...hat.com" <sgarzare@...hat.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Gonglei (Arei)" <arei.gonglei@...wei.com>
Subject: RE: [PATCH] vdpa_sim: avoid putting an uninitialized iova_domain



> -----Original Message-----
> From: Jason Wang [mailto:jasowang@...hat.com]
> Sent: Tuesday, November 23, 2021 12:13 PM
> To: Parav Pandit <parav@...dia.com>
> Cc: Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> <longpeng2@...wei.com>; mst@...hat.com; sgarzare@...hat.com; Max Gurtovoy
> <mgurtovoy@...dia.com>; virtualization@...ts.linux-foundation.org;
> linux-kernel@...r.kernel.org; Gonglei (Arei) <arei.gonglei@...wei.com>
> Subject: Re: [PATCH] vdpa_sim: avoid putting an uninitialized iova_domain
> 
> On Tue, Nov 23, 2021 at 11:12 AM Parav Pandit <parav@...dia.com> wrote:
> >
> >
> >
> > > From: Longpeng(Mike) <longpeng2@...wei.com>
> > > Sent: Monday, November 22, 2021 5:52 PM
> > >
> > > From: Longpeng <longpeng2@...wei.com>
> > >
> > > The system will crash if we put an uninitialized iova_domain, this could
> > > happen when an error occurs before initializing the iova_domain in
> > > vdpasim_create().
> > >
> > > BUG: kernel NULL pointer dereference, address: 0000000000000000 ...
> > > RIP: 0010:__cpuhp_state_remove_instance+0x96/0x1c0
> > > ...
> > > Call Trace:
> > >  <TASK>
> > >  put_iova_domain+0x29/0x220
> > >  vdpasim_free+0xd1/0x120 [vdpa_sim]
> > >  vdpa_release_dev+0x21/0x40 [vdpa]
> > >  device_release+0x33/0x90
> > >  kobject_release+0x63/0x160
> > >  vdpasim_create+0x127/0x2a0 [vdpa_sim]
> > >  vdpasim_net_dev_add+0x7d/0xfe [vdpa_sim_net]
> > >  vdpa_nl_cmd_dev_add_set_doit+0xe1/0x1a0 [vdpa]
> > >  genl_family_rcv_msg_doit+0x112/0x140
> > >  genl_rcv_msg+0xdf/0x1d0
> > >  ...
> > >
> > > So we must make sure the iova_domain is already initialized before put it.
> > >
> > > In addition, we may get the following warning in this case:
> > > WARNING: ... drivers/iommu/iova.c:344 iova_cache_put+0x58/0x70
> > >
> > > So we must make sure the iova_cache_put() is invoked only if the
> > > iova_cache_get() is already invoked. Let's fix it together.
> > >
> > > Signed-off-by: Longpeng <longpeng2@...wei.com>
> >
> > Can you please add the fixes tag here so that older kernels can take this fix?
> >
> 
> I guess it's 4080fc106750 ("vdpa_sim: use iova module to allocate IOVA
> addresses")
> 

I think so. I'll add the fixes tag in V2, thanks.

> Thanks