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Date: Tue, 6 Dec 2022 09:58:34 +0300 From: Artem Chernyshev <artem.chernyshev@...-soft.ru> To: Vishnu Dasa <vdasa@...are.com>, Stefano Garzarella <sgarzare@...hat.com> Cc: Artem Chernyshev <artem.chernyshev@...-soft.ru>, VMware PV-Drivers Reviewers <pv-drivers@...are.com>, Bryan Tan <bryantan@...are.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 v4] net: vmw_vsock: vmci: Check memcpy_from_msg() vmci_transport_dgram_enqueue() does not check the return value of memcpy_from_msg(). If memcpy_from_msg() fails, it is possible that uninitialized memory contents are sent unintentionally instead of user's message in the datagram to the destination. Return with an error if memcpy_from_msg() 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> Reviewed-by: Stefano Garzarella <sgarzare@...hat.com> Reviewed-by: Vishnu Dasa <vdasa@...are.com> --- V1->V2 Fix memory leaking and updates for description V2->V3 Return the value of memcpy_from_msg() V3->V4 Updates for description net/vmw_vsock/vmci_transport.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c index 842c94286d31..36eb16a40745 100644 --- a/net/vmw_vsock/vmci_transport.c +++ b/net/vmw_vsock/vmci_transport.c @@ -1711,7 +1711,11 @@ static int vmci_transport_dgram_enqueue( if (!dg) return -ENOMEM; - memcpy_from_msg(VMCI_DG_PAYLOAD(dg), msg, len); + err = memcpy_from_msg(VMCI_DG_PAYLOAD(dg), msg, len); + if (err) { + kfree(dg); + return err; + } dg->dst = vmci_make_handle(remote_addr->svm_cid, remote_addr->svm_port); -- 2.30.3
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