linux-ext4 - [Bug 199321] use-after-free in jbd2_journal_commit_transaction() when mounting and operating a crafted ext4 image

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Message-ID: <bug-199321-13602-ExaaciCl8N@https.bugzilla.kernel.org/>
Date:   Tue, 10 Apr 2018 04:29:47 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 199321] use-after-free in jbd2_journal_commit_transaction()
 when mounting and operating a crafted ext4 image

https://bugzilla.kernel.org/show_bug.cgi?id=199321

Eric Biggers (ebiggers3@...il.com) changed:

           What    |Removed                     |Added
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                 CC|                            |ebiggers3@...il.com

--- Comment #2 from Eric Biggers (ebiggers3@...il.com) ---
FYI, the reproducer doesn't work unless I revert commit 18db4b4e6fc31 ("ext4:
don't allow r/w mounts if metadata blocks overlap the superblock").  So while
this might be a different bug, it's not obvious since your reproducer no longer
works.  Wen, it would save a lot of time if you tested the latest ext4
development branch from kernel.org so that you're including the latest fixes. 
You *could* test LTS or stable kernels too to identify missed backports (while
keeping in mind that it can take several weeks for a patch to land there after
being applied upstream), but new bugs really should reported with a working
reproducer against the latest ext4 development branch. Thanks!

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