[PATCH] net: vmw_vsock: vmci: Check memcpy_from_msg()

From: Artem Chernyshev <artem.chernyshev@red-soft.ru>
To: Bryan Tan <bryantan@vmware.com>, Vishnu Dasa <vdasa@vmware.com>
Cc: Artem Chernyshev <artem.chernyshev@red-soft.ru>,
	VMware PV-Drivers Reviewers <pv-drivers@vmware.com>,
	Stefano Garzarella <sgarzare@redhat.com>,
	Jakub Kicinski <kuba@kernel.org>,
	linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, lvc-project@linuxtesting.org
Subject: [PATCH] net: vmw_vsock: vmci: Check memcpy_from_msg()
Date: Sat,  3 Dec 2022 01:58:18 +0300	[thread overview]
Message-ID: <20221202225818.3934909-1-artem.chernyshev@red-soft.ru> (raw)

We returns from vmci_transport_dgram_enqueue() with error
if memcpy goes wrong

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 0f7db23a07af ("vmci_transport: switch ->enqeue_dgram, ->enqueue_stream and ->dequeue_stream to msghdr")
Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
---
 net/vmw_vsock/vmci_transport.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
index 842c94286d31..7994090e0314 100644
--- a/net/vmw_vsock/vmci_transport.c
+++ b/net/vmw_vsock/vmci_transport.c
@@ -1711,7 +1711,8 @@ static int vmci_transport_dgram_enqueue(
 	if (!dg)
 		return -ENOMEM;
 
-	memcpy_from_msg(VMCI_DG_PAYLOAD(dg), msg, len);
+	if (memcpy_from_msg(VMCI_DG_PAYLOAD(dg), msg, len))
+		return -EFAULT;
 
 	dg->dst = vmci_make_handle(remote_addr->svm_cid,
 				   remote_addr->svm_port);
-- 
2.30.3

