linux-ext4 - Re: [RFC PATCH] ext4: validate number of meta clusters in group

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Message-ID: <20160711025153.GO26097@thunk.org>
Date:	Sun, 10 Jul 2016 22:51:53 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Vegard Nossum <vegard.nossum@...cle.com>
Cc:	"Darrick J. Wong" <darrick.wong@...cle.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH] ext4: validate number of meta clusters in group

On Thu, Jul 07, 2016 at 10:10:40PM +0200, Vegard Nossum wrote:
> 
> I ran into a second problem (this time it was num_clusters_in_group()
> returning a bogus value) with the same symptoms (random memory
> corruptions), the new attached patch fixes both problems by checking the
> values at mount time.

Can you give me a dumpe2fs -h of a file system that is causing
num_clusters_in_group() to be bogus?

I want to make sure I'm checking that correct base values, insteda of
doing a brute force loop over all of the block groups and calling
ext4_num_clusters_in_group() and ext4_num_base_meta_clusters() for all
block groups.

Thanks!!

					- Ted
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