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Tsirkin" To: Dan Carpenter Cc: Eugenio =?iso-8859-1?Q?P=E9rez?= , Jason Wang , kvm@vger.kernel.org, virtualization@lists.linux.dev, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: Re: [PATCH] vhost-vdpa: Set s.num in GET_VRING_GROUP Message-ID: <20250927083043-mutt-send-email-mst@kernel.org> References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Sat, Sep 27, 2025 at 03:25:34PM +0300, Dan Carpenter wrote: > The group is supposed to be copied to the user, but it wasn't assigned > until after the copy_to_user(). Move the "s.num = group;" earlier. > > Fixes: ffc3634b6696 ("vduse: add vq group support") > Signed-off-by: Dan Carpenter > --- > This goes through the kvm tree I think. Thanks for the patch! IIUC this was in my tree for next, but more testing and review found issues (like this one) so I dropped it for now. > drivers/vhost/vdpa.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c > index 6305382eacbb..25ab4d06e559 100644 > --- a/drivers/vhost/vdpa.c > +++ b/drivers/vhost/vdpa.c > @@ -667,9 +667,9 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, > group = ops->get_vq_group(vdpa, idx); > if (group >= vdpa->ngroups || group > U32_MAX || group < 0) > return -EIO; > - else if (copy_to_user(argp, &s, sizeof(s))) > - return -EFAULT; > s.num = group; > + if (copy_to_user(argp, &s, sizeof(s))) > + return -EFAULT; > return 0; > } > case VHOST_VDPA_GET_VRING_DESC_GROUP: > -- > 2.51.0