Bug 249727 - xenbus has use-after-free in drivers/xen/xenbus/xenbus_xs.c
xenbus has use-after-free in drivers/xen/xenbus/xenbus_xs.c
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel-xen (Show other bugs)
All Linux
low Severity low
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Assigned To: Don Dutile
Martin Jenner
Depends On:
Blocks: 249728
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Reported: 2007-07-26 14:15 EDT by Don Dutile
Modified: 2008-07-24 15:14 EDT (History)
3 users (show)

See Also:
Fixed In Version: RHSA-2008-0665
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2008-07-24 15:14:46 EDT
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Regression: ---
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Don Dutile 2007-07-26 14:15:52 EDT
Description of problem:

The Coverity checker spotted the following use-after-free
in drivers/xen/xenbus/xenbus_xs.c:

<--  snip  -->
static int process_msg(void)
               if (IS_ERR(msg->u.watch.vec)) {
                       err = PTR_ERR(msg->u.watch.vec);

<--  snip  -->

Version-Release number of selected component (if applicable): 4.5

How reproducible:
Would need to exhaust system memory to generate a ENOMEM while performing
xenstore access by xenbus driver

Steps to Reproduce:
Actual results:

Expected results:

Additional info:
Comment 1 RHEL Product and Program Management 2007-07-26 14:25:28 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
Comment 2 RHEL Product and Program Management 2007-09-07 15:34:21 EDT
This request was previously evaluated by Red Hat Product Management
for inclusion in the current Red Hat Enterprise Linux release, but
Red Hat was unable to resolve it in time.  This request will be
reviewed for a future Red Hat Enterprise Linux release.
Comment 3 Jason Baron 2008-01-10 17:01:24 EST
committed in stream U7 build 68.6. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/
Comment 7 errata-xmlrpc 2008-07-24 15:14:46 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.


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