Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

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