linux-kernel - [PATCH v2] net: vmw_vsock: vmci: Check memcpy_from

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Message-Id: <20221203083312.923029-1-artem.chernyshev@red-soft.ru>
Date:   Sat,  3 Dec 2022 11:33:12 +0300
From:   Artem Chernyshev <artem.chernyshev@...-soft.ru>
To:     Vishnu Dasa <vdasa@...are.com>, Bryan Tan <bryantan@...are.com>
Cc:     Artem Chernyshev <artem.chernyshev@...-soft.ru>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: [PATCH v2] net: vmw_vsock: vmci: Check memcpy_from_msg()

vmci_transport_dgram_enqueue() does not check the return value
of memcpy_from_msg(). Return with an error if the memcpy fails.

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@...-soft.ru>
---
V1->V2 Fix memory leaking and updates for description

 net/vmw_vsock/vmci_transport.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
index 842c94286d31..c94c3deaa09d 100644
--- a/net/vmw_vsock/vmci_transport.c
+++ b/net/vmw_vsock/vmci_transport.c
@@ -1711,7 +1711,10 @@ 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)) {
+		kfree(dg);
+		return -EFAULT;
+	}
 
 	dg->dst = vmci_make_handle(remote_addr->svm_cid,
 				   remote_addr->svm_port);
-- 
2.30.3