netdev - Re: [PATCH 1/5] hv_sock: Check hv_pkt_iter_first

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Date:   Thu, 21 Apr 2022 15:50:57 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     "Andrea Parri (Microsoft)" <parri.andrea@...il.com>
Cc:     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>,
        Michael Kelley <mikelley@...rosoft.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-hyperv@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] hv_sock: Check hv_pkt_iter_first_raw()'s return value

On Wed, Apr 20, 2022 at 10:07:16PM +0200, Andrea Parri (Microsoft) wrote:
>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: Stefano Garzarella <sgarzare@...hat.com>