Bug 232211 - double free memory corruption in smbfs
double free memory corruption in smbfs
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Jeff Layton
Martin Jenner
Depends On:
  Show dependency treegraph
Reported: 2007-03-14 08:36 EDT by Vasily Averin
Modified: 2008-01-09 12:29 EST (History)
3 users (show)

See Also:
Fixed In Version: RHBA-2007-0791
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2007-11-15 11:21:50 EST
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
smbfs double free memory corruption fix (326 bytes, patch)
2007-03-14 08:36 EDT, Vasily Averin
no flags Details | Diff

  None (edit)
Description Vasily Averin 2007-03-14 08:36:58 EDT
SWsoft Virtuozzo/OpenVZ Linux kernel team has discovered double free memory
corruption in smbfs.

Smbfs allocates rq_trans2buffer to handle server's multi transaction2 response
messages. As struct smb_request may be reused, rq_trans2buffer is freed before
each new request. However if last servers's response is not multi but single
trans2 message then new rq_trans2buffer is not allocated but last smb_rput still
tries to free it again.
To prevent this issue rq_trans2buffer pointer should be set to NULL after kfree
Comment 1 Vasily Averin 2007-03-14 08:36:58 EDT
Created attachment 150030 [details]
smbfs double free memory corruption fix
Comment 2 Jeff Layton 2007-05-07 11:41:08 EDT
Thanks, patch looks sane. I'll plan to propose it for inclusion...
Comment 4 RHEL Product and Program Management 2007-05-07 12:21:44 EDT
This request was evaluated by Red Hat Kernel Team for inclusion in a Red
Hat Enterprise Linux maintenance release, and has moved to bugzilla 
status POST.
Comment 5 Jason Baron 2007-06-22 10:26:27 EDT
committed in stream U6 build 55.11. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/
Comment 8 errata-xmlrpc 2007-11-15 11:21:50 EST
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 the 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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