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Bug 450770

Summary: ext3: potential data corruption on log replay
Product: Red Hat Enterprise Linux 5 Reporter: Eric Sandeen <esandeen>
Component: kernelAssignee: Eric Sandeen <esandeen>
Status: CLOSED DUPLICATE QA Contact: Martin Jenner <mjenner>
Severity: low Docs Contact:
Priority: low    
Version: 5.2   
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-06-12 14:29:45 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: 450772    

Description Eric Sandeen 2008-06-10 21:05:02 UTC 
This is very rare but also obvious enough I think it's worth fixing up.

From: Duane Griffin <duaneg>
Date: Thu, 20 Mar 2008 00:00:53 +0000 (-0700)
Subject: jbd: correctly unescape journal data blocks
X-Git-Tag: v2.6.25-rc7~82
X-Git-Url:
http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=439aeec639d7c57f3561054a6d315c40fd24bb74

jbd: correctly unescape journal data blocks

Fix a long-standing typo (predating git) that will cause data corruption if a
journal data block needs unescaping.  At the moment the wrong buffer head's
data is being unescaped.

To test this case mount a filesystem with data=journal, start creating and
deleting a bunch of files containing only JFS_MAGIC_NUMBER (0xc03b3998), then
pull the plug on the device.  Without this patch the files will contain zeros
instead of the correct data after recovery.

Signed-off-by: Duane Griffin <duaneg>
Acked-by: Jan Kara <jack>
Cc: <linux-ext4.org>
Cc: <stable>
Signed-off-by: Andrew Morton <akpm>
Signed-off-by: Linus Torvalds <torvalds>
Comment 1 RHEL Program Management 2008-06-10 21:10:02 UTC 
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
release.
Comment 3 Eric Sandeen 2008-06-12 14:29:45 UTC 
oops, Josef already sent this!

*** This bug has been marked as a duplicate of 447742 ***