linux-ext4 - Re: [PATCH 20/24] e2fsck: pass2 should not process directory blocks that are impossibly large

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Date:	Fri, 25 Jul 2014 08:42:03 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 20/24] e2fsck: pass2 should not process directory blocks
 that are impossibly large

On Fri, Jul 18, 2014 at 03:54:46PM -0700, Darrick J. Wong wrote:
> Currently, directories cannot be fallocated, which means that the only
> way they get bigger is for the kernel to append blocks one by one.
> Therefore, if we encounter a logical block offset that is too big, we
> needn't bother adding it to the dblist for pass2 processing, because
> it's unlikely to contain a valid directory block.  The code that
> handles extent based directories also does not add toobig blocks to
> the dblist.
> 
> Note that we can easily cause e2fsck to fail with ENOMEM if we start
> feeding it really large logical block offsets, as the dblist
> implementation will try to realloc() an array big enough to hold it.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>

Thanks, applied.

						- Ted
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