linux-kernel - Re: [PATCH] virtio-vdpa: Fix unchecked call to NULL set_vq

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Message-ID: <209b4b364facec3cc26f3d12acd4b466b9278b47.camel@nvidia.com>
Date:   Thu, 4 May 2023 17:19:55 +0000
From:   Dragos Tatulea <dtatulea@...dia.com>
To:     Feng Liu <feliu@...dia.com>,
        "xieyongji@...edance.com" <xieyongji@...edance.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "xuanzhuo@...ux.alibaba.com" <xuanzhuo@...ux.alibaba.com>
CC:     "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Gal Pressman <gal@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] virtio-vdpa: Fix unchecked call to NULL set_vq_affinity

On Thu, 2023-05-04 at 13:08 -0400, Feng Liu wrote:
> 
> 
> On 2023-05-04 a.m.9:50, Dragos Tatulea wrote:
> > External email: Use caution opening links or attachments
> > 
> > 
> > The referenced patch calls set_vq_affinity without checking if the op is
> > valid. This patch adds the check.
> > 
> > Fixes: 3dad56823b53 ("virtio-vdpa: Support interrupt affinity spreading
> > mechanism")
> > Reviewed-by: Gal Pressman <gal@...dia.com>
> > Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
> > ---
> >   drivers/virtio/virtio_vdpa.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
> > index eb6aee8c06b2..989e2d7184ce 100644
> > --- a/drivers/virtio/virtio_vdpa.c
> > +++ b/drivers/virtio/virtio_vdpa.c
> > @@ -385,7 +385,9 @@ static int virtio_vdpa_find_vqs(struct virtio_device
> > *vdev, unsigned int nvqs,
> >                          err = PTR_ERR(vqs[i]);
> >                          goto err_setup_vq;
> >                  }
> > -               ops->set_vq_affinity(vdpa, i, &masks[i]);
> > +
> > +               if (ops->set_vq_affinity)
> > +                       ops->set_vq_affinity(vdpa, i, &masks[i]);
> if ops->set_vq_affinity is NULL, should give an error code to err, and 
> return err
> 
I don't think so: the set_vq_affinity is marked as optional.

> >          }
> > 
> >          cb.callback = virtio_vdpa_config_cb;
> > --
> > 2.40.1
> >