linux-kernel - Re: [PATCH for 5.10] vdpa_sim: fix param validation in vdpasim_get

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Message-ID: <d5f8c1b7-9506-6a84-dbba-53bf21897e5f@redhat.com>
Date:   Thu, 18 Feb 2021 14:39:15 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>, stable@...r.kernel.org
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Eli Cohen <elic@...dia.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH for 5.10] vdpa_sim: fix param validation in
 vdpasim_get_config()


On 2021/2/12 上午12:25, Stefano Garzarella wrote:
> Commit 65b709586e222fa6ffd4166ac7fdb5d5dad113ee upstream.
>
> Before this patch, if 'offset + len' was equal to
> sizeof(struct virtio_net_config), the entire buffer wasn't filled,
> returning incorrect values to the caller.
>
> Since 'vdpasim->config' type is 'struct virtio_net_config', we can
> safely copy its content under this condition.
>
> Commit 65b709586e22 ("vdpa_sim: add get_config callback in
> vdpasim_dev_attr") unintentionally solved it upstream while
> refactoring vdpa_sim.c to support multiple devices. But we don't want
> to backport it to stable branches as it contains many changes.
>
> Fixes: 2c53d0f64c06 ("vdpasim: vDPA device simulator")
> Cc: <stable@...r.kernel.org> # 5.10.x
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
> ---
>   drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index 6a90fdb9cbfc..8ca178d7b02f 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -572,7 +572,7 @@ static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
>   {
>   	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
>   
> -	if (offset + len < sizeof(struct virtio_net_config))
> +	if (offset + len <= sizeof(struct virtio_net_config))
>   		memcpy(buf, (u8 *)&vdpasim->config + offset, len);
>   }
>   


Acked-by: Jason Wang <jasowang@...hat.com>