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Bug 631509

Summary:	spice: qxl overruns the release ring
Product:	Red Hat Enterprise Linux 5	Reporter:	Gerd Hoffmann <kraxel>
Component:	kvm	Assignee:	Gerd Hoffmann <kraxel>
Status:	CLOSED NOTABUG	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	low
Version:	5.5	CC:	mkenneth, virt-maint, ykaul
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	631502	Environment:
Last Closed:	2010-09-09 09:36:46 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	631502
Bug Blocks:	580949

Description Gerd Hoffmann 2010-09-07 19:51:14 UTC

+++ This bug was initially created as a clone of Bug #631502 +++

Description of problem:
The qxl backend in qemu can overrun the release ring.  The result is that the guest will miss release events, thus will not release the qxl device memory associated with them.  The memory leak may make qxl go out of memory and stop working.

Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.113.el6.x86_64

How reproducible:
No reproducer, found by code review.

--- Additional comment from kraxel on 2010-09-07 21:49:04 CEST ---

Created attachment 445768 [details]
fix

Comment 1 Gerd Hoffmann 2010-09-09 09:36:46 UTC

Patch review figured code is correct as-is.