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Bug 232211

Summary: double free memory corruption in smbfs
Product: Red Hat Enterprise Linux 4 Reporter: Vasily Averin <vvs>
Component: kernelAssignee: Jeff Layton <jlayton>
Status: CLOSED ERRATA QA Contact: Martin Jenner <mjenner>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.4CC: khorenko, staubach, steved
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: RHBA-2007-0791 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2007-11-15 16:21:50 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Description Flags
smbfs double free memory corruption fix none

Description Vasily Averin 2007-03-14 12:36:58 UTC
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 12:36:58 UTC
Created attachment 150030 [details]
smbfs double free memory corruption fix

Comment 2 Jeff Layton 2007-05-07 15:41:08 UTC
Thanks, patch looks sane. I'll plan to propose it for inclusion...

Comment 4 RHEL Product and Program Management 2007-05-07 16:21:44 UTC
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 14:26:27 UTC
committed in stream U6 build 55.11. A test kernel with this patch is available

Comment 8 errata-xmlrpc 2007-11-15 16:21:50 UTC
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.