linux-ext4 - Re: [PATCH 4/5] ext4: don't crash when validating block bitmap

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Message-ID: <20140512142457.GG31376@thunk.org>
Date:	Mon, 12 May 2014 10:24:57 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <darrick.wong@...cle.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 4/5] ext4: don't crash when validating block bitmap

On Thu, May 01, 2014 at 04:17:47PM -0700, Darrick J. Wong wrote:
> If EXT4FS_DEBUG is defined, ext4_validate_block_bitmap is called via
> ext4_count_free_clusters before sb->s_group_info is set up.  When this
> happens, the kernel crashes because group info hasn't been loaded.
> Forego marking the group corrupt for now; not setting BH_Verified
> means we'll revisit the bitmap if something went wrong.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>

This shouldn't be necessary that we have this in the ext4 tree, right?

commit 007649375f6af242d5b1df2c15996949714303ba
Author: Azat Khuzhin <a3at.mail@...il.com>
Date:   Mon Apr 7 10:54:20 2014 -0400

    ext4: initialize multi-block allocator before checking block descriptors
    
    With EXT4FS_DEBUG ext4_count_free_clusters() will call
    ext4_read_block_bitmap() without s_group_info initialized, so we need to
    initialize multi-block allocator before.
    
    ...

						- Ted
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