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

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

Eric Biggers (ebiggers3@xxxxxxxxx) changed:

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--- Comment #2 from Eric Biggers (ebiggers3@xxxxxxxxx) ---
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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