Bug 539583

Summary: qemu use-after-free crash in slirp/m_free()
Product: [Fedora] Fedora Reporter: Paul Fee <paul.f.fee>
Component: qemuAssignee: Mark McLoughlin <markmc>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 12CC: berrange, dwmw2, gcosta, itamar, jaswinder, jforbes, markmc, quintela, virt-maint
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard: abrt_hash:e862c6160eab5d20796537e576355d242d745aa2
Fixed In Version: 0.11.0-12.fc12 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2009-12-08 08:03:59 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:    
Bug Blocks: 498969    
Attachments:
Description Flags
File: backtrace
none
File: cmdline none

Description Paul Fee 2009-11-20 16:46:56 UTC 
abrt detected a crash.

Comment: Using yum to install packages on guest machine.  Guest was running Centos5.4
Attached file: backtrace
Attached file: cmdline
component: qemu
executable: /usr/bin/qemu-kvm
kernel: 2.6.31.5-127.fc12.x86_64
package: qemu-system-x86-2:0.11.0-11.fc12
rating: 3
reason: Process was terminated by signal 11
Comment 1 Paul Fee 2009-11-20 16:47:00 UTC 
Created attachment 372540 [details]
File: backtrace
Comment 2 Paul Fee 2009-11-20 16:47:05 UTC 
Created attachment 372541 [details]
File: cmdline
Comment 3 Mark McLoughlin 2009-11-20 18:08:45 UTC 
Beautiful:

  http://repo.or.cz/w/qemu.git/commitdiff/460fec67ee

        if (m->m_flags & M_DOFREE) {
                free(m);
-               mbuf_alloced--;
+               m->slirp->mbuf_alloced--;
Comment 4 Mark McLoughlin 2009-11-20 18:30:46 UTC 
Thanks for the report!

Building this fix now:

* Fri Nov 20 2009 Mark McLoughlin <markmc> - 2:0.11.0-12
- Fix a use-after-free crasher in the slirp code (#539583)
- Fix overflow in the parallels image format support (#533573)
Comment 5 Fedora Update System 2009-11-20 19:12:50 UTC 
qemu-0.11.0-12.fc12 has been submitted as an update for Fedora 12.
http://admin.fedoraproject.org/updates/qemu-0.11.0-12.fc12
Comment 6 Fedora Update System 2009-11-24 07:36:00 UTC 
qemu-0.11.0-12.fc12 has been pushed to the Fedora 12 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update qemu'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F12/FEDORA-2009-11901
Comment 7 Fedora Update System 2009-12-08 08:03:47 UTC 
qemu-0.11.0-12.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.