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vhost: move vdpa group bound check to vhost_vdpa

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Remove duplication by consolidating these here.  This reduces the
posibility of a parent driver missing them.

While we're at it, fix a bug in vdpa_sim where a valid ASID can be
assigned to a group equal to ngroups, causing an out of bound write.

Cc: stable@vger.kernel.org
Fixes: bda324fd03 ("vdpasim: control virtqueue support")
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20260119143306.1818855-2-eperezma@redhat.com>
This commit is contained in:
Eugenio Pérez
2026-01-19 15:32:54 +01:00
committed by Michael S. Tsirkin
parent 74bc5f69bd
commit cd025c1e87
3 changed files with 1 additions and 10 deletions
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2
drivers/vhost/vdpa.c
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@@ -680,7 +680,7 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
case VHOST_VDPA_SET_GROUP_ASID:
if (copy_from_user(&s, argp, sizeof(s)))
return -EFAULT;
if (s.num >= vdpa->nas)
if (idx >= vdpa->ngroups || s.num >= vdpa->nas)
return -EINVAL;
if (!ops->set_group_asid)
return -EOPNOTSUPP;