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Description of problem:
If qemu-kvm command is launched with unspecified port option (e.g. "-spice port="), it starts normally.

Version-Release number of selected component (if applicable):
qemu-kvm-1.5.3-129.el7.x86_64
and qemu-kvm-rhev.2.6.0-28.el7.x86_64


How reproducible:
always

Steps to Reproduce:
1.Start VM with unspecified spice port ('-spice port=') for example:
/usr/libexec/qemu-kvm -machine pc  -nodefaults  -vga qxl   -device intel-hda,bus=pci.0,addr=03  -device hda-duplex -device virtio-serial-pci,id=virtio_serial_pci0,bus=pci.0,addr=04 -chardev spicevmc,id=idSwuYmk,name=vdagent -devicevirtserialport,id=idBWNLHY,name=com.redhat.spice.0,bus=virtio_serial_pci0.0,chardev=idSwuYmk -drive id=drive_image1,if=none,cache=none,format=qcow2,file=Rhel7.2 -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=0,bus=pci.0,addr=05 -m 1024 -spice disable-ticketing,port=  -monitor stdio
 

Actual results:
VM starts normally. 
(qemu) info spice -> No listening address specified

Expected results:
qemu-kvm will exit with code 1, and following message:
'neither port nor tls-port specified for spice' or something like this

Sent one-liner  patch "[PATCH] qemu-option: reject empty number value", not sure it's really going to happen, foo= default to value 0 is perhaps an acceptable behaviour.

Fixed from 2.9:

commit 3403e5eb884f3a74c40fe7cccc103f848c040215
Author: Markus Armbruster <armbru>
Date:   Tue Feb 21 21:13:53 2017 +0100

    option: Fix to reject invalid and overflowing numbers

sent patch to rhvirt-list "[RHEL-7.4 qemu-kvm PATCH] qemu-option: reject empty number value"

sent new version "[RHEL-7.5 qemu-kvm PATCH v2] qemu-option: reject empty number value"

Fix included in qemu-kvm-1.5.3-148.el7

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:0816