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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: 0f7db23a07 ("vmci_transport: switch ->enqeue_dgram, ->enqueue_stream and ->dequeue_stream to msghdr")
Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Vishnu Dasa <vdasa@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Artem Chernyshev 2022-12-06 09:58:34 +03:00 committed by David S. Miller
parent 010b6761a9
commit 44aa5a6dba
1 changed files with 5 additions and 1 deletions
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6
net/vmw_vsock/vmci_transport.c
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@ -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);