On Mon, Dec 13, 2021 at 10:43 PM Eli Cohen <[email protected]> wrote:
>
> Avoid reading device configuration during feature negotiation. Read
> device status and verify that VIRTIO_CONFIG_S_FEATURES_OK is set.
> Otherwise, return -EAGAIN.
>
> Signed-off-by: Eli Cohen <[email protected]>
> ---
> drivers/vdpa/vdpa.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 42d71d60d5dc..5749cf0a1500 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -819,8 +819,15 @@ vdpa_dev_config_fill(struct vdpa_device *vdev, struct
> sk_buff *msg, u32 portid,
> {
> u32 device_id;
> void *hdr;
> + u8 status;
> int err;
>
> + status = vdev->config->get_status(vdev);
> + if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) {
> + NL_SET_ERR_MSG_MOD(extack, "Features negotiation not
> completed");
> + return -EAGAIN;
> + }
> +
> hdr = genlmsg_put(msg, portid, seq, &vdpa_nl_family, flags,
> VDPA_CMD_DEV_CONFIG_GET);
> if (!hdr)
It looks to me we need to synchronize this with set_status() and
cf_mutex (set_config).
Or simply return all the config space (the maximum set of features)
Thanks
> --
> 2.33.1
>
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