From: "Andrea Parri (Microsoft)" <parri.andrea@gmail.com>
To: KY Srinivasan <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
Stefano Garzarella <sgarzare@redhat.com>,
David Miller <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>
Cc: linux-hyperv@vger.kernel.org,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
"Andrea Parri (Microsoft)" <parri.andrea@gmail.com>
Subject: [RFC PATCH 1/6] hv_sock: Check hv_pkt_iter_first_raw()'s return value
Date: Wed, 13 Apr 2022 22:47:37 +0200 [thread overview]
Message-ID: <20220413204742.5539-2-parri.andrea@gmail.com> (raw)
In-Reply-To: <20220413204742.5539-1-parri.andrea@gmail.com>
The function returns NULL if the ring buffer has no enough space
available for a packet descriptor. The ring buffer's write_index
is in memory which is shared with the Hyper-V host, its value is
thus subject to being changed at any time.
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.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
next prev parent reply other threads:[~2022-04-13 20:48 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-13 20:47 [RFC PATCH 0/6] hv_sock: Hardening changes Andrea Parri (Microsoft)
2022-04-13 20:47 ` Andrea Parri (Microsoft) [this message]
2022-04-15 3:33 ` [RFC PATCH 1/6] hv_sock: Check hv_pkt_iter_first_raw()'s return value Michael Kelley (LINUX)
2022-04-15 6:41 ` Andrea Parri
2022-04-15 14:27 ` Michael Kelley (LINUX)
2022-04-15 16:09 ` Andrea Parri
2022-04-13 20:47 ` [RFC PATCH 2/6] hv_sock: Copy packets sent by Hyper-V out of the ring buffer Andrea Parri (Microsoft)
2022-04-15 3:33 ` Michael Kelley (LINUX)
2022-04-15 6:42 ` Andrea Parri
2022-04-13 20:47 ` [RFC PATCH 3/6] hv_sock: Add validation for untrusted Hyper-V values Andrea Parri (Microsoft)
2022-04-13 20:47 ` [RFC PATCH 4/6] hv_sock: Initialize send_buf in hvs_stream_enqueue() Andrea Parri (Microsoft)
2022-04-15 3:33 ` Michael Kelley (LINUX)
2022-04-15 6:50 ` Andrea Parri
2022-04-15 14:30 ` Michael Kelley (LINUX)
2022-04-15 16:16 ` Andrea Parri
2022-04-13 20:47 ` [RFC PATCH 5/6] Drivers: hv: vmbus: Accept hv_sock offers in isolated guests Andrea Parri (Microsoft)
2022-04-15 3:33 ` Michael Kelley (LINUX)
2022-04-15 6:58 ` Andrea Parri
2022-04-13 20:47 ` [RFC PATCH 6/6] Drivers: hv: vmbus: Refactor the ring-buffer iterator functions Andrea Parri (Microsoft)
2022-04-15 3:34 ` Michael Kelley (LINUX)
2022-04-15 7:00 ` Andrea Parri
2022-04-15 16:28 ` Andrea Parri
2022-04-15 16:44 ` Michael Kelley (LINUX)
2022-04-15 17:05 ` Andrea Parri
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