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Date:   Wed, 20 Apr 2022 23:07:14 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     "Andrea Parri (Microsoft)" <parri.andrea@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/5] hv_sock: Check hv_pkt_iter_first_raw()'s return value

From: Andrea Parri (Microsoft) <parri.andrea@...il.com> Sent: Wednesday, April 20, 2022 1:07 PM
> 
> The function returns NULL if the ring buffer doesn't contain enough
> readable bytes to constitute a packet descriptor.  The ring buffer's
> write_index is in memory which is shared with the Hyper-V host, an
> erroneous or malicious host could thus change its value and overturn
> the result of hvs_stream_has_data().
> 
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> ---
>  net/vmw_vsock/hyperv_transport.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c
> index e111e13b66604..943352530936e 100644
> --- a/net/vmw_vsock/hyperv_transport.c
> +++ b/net/vmw_vsock/hyperv_transport.c
> @@ -603,6 +603,8 @@ static ssize_t hvs_stream_dequeue(struct vsock_sock *vsk,
> struct msghdr *msg,
> 
>  	if (need_refill) {
>  		hvs->recv_desc = hv_pkt_iter_first_raw(hvs->chan);
> +		if (!hvs->recv_desc)
> +			return -ENOBUFS;
>  		ret = hvs_update_recv_data(hvs);
>  		if (ret)
>  			return ret;
> --
> 2.25.1

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>

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