linux-kernel - Re: [PATCH 2/4] vfio: use __aligned_u64 in struct vfio_device_gfx_plane

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Date:   Tue, 15 Aug 2023 08:38:17 -0400
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     kvm@...r.kernel.org, "Tian, Kevin" <kevin.tian@...el.com>,
        linux-kernel@...r.kernel.org,
        Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH 2/4] vfio: use __aligned_u64 in struct
 vfio_device_gfx_plane_info

On Mon, Aug 14, 2023 at 02:50:40PM -0300, Jason Gunthorpe wrote:
> On Wed, Aug 09, 2023 at 05:02:46PM -0400, Stefan Hajnoczi wrote:
> > diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> > index de675d799c7d..ffab3536dc8a 100644
> > --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> > +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> > @@ -1382,7 +1382,7 @@ static long intel_vgpu_ioctl(struct vfio_device *vfio_dev, unsigned int cmd,
> >  		intel_gvt_reset_vgpu(vgpu);
> >  		return 0;
> >  	} else if (cmd == VFIO_DEVICE_QUERY_GFX_PLANE) {
> > -		struct vfio_device_gfx_plane_info dmabuf;
> > +		struct vfio_device_gfx_plane_info dmabuf = {};
> >  		int ret = 0;
> >  
> >  		minsz = offsetofend(struct vfio_device_gfx_plane_info,
> > @@ -1392,6 +1392,8 @@ static long intel_vgpu_ioctl(struct vfio_device *vfio_dev, unsigned int cmd,
> >  		if (dmabuf.argsz < minsz)
> >  			return -EINVAL;
> >  
> > +		minsz = min(minsz, sizeof(dmabuf));
> > +
> 
> Huh?
> 
>  minsz = min(sizeof(dmabuf), dmabuf.argsz)

Thanks for catching this. I will fix it in the next revision.

Stefan

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