linux-ext4 - Re: [PATCH v2] ext4: add reserved GDT blocks check

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Message-Id: <165552108974.634564.9535249162879745739.b4-ty@mit.edu>
Date:   Fri, 17 Jun 2022 22:59:03 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     linux-ext4@...r.kernel.org, Zhang Yi <yi.zhang@...wei.com>
Cc:     "Theodore Ts'o" <tytso@....edu>, ritesh.list@...il.com,
        yukuai3@...wei.com, jack@...e.cz, adilger.kernel@...ger.ca
Subject: Re: [PATCH v2] ext4: add reserved GDT blocks check

On Wed, 1 Jun 2022 17:27:17 +0800, Zhang Yi wrote:
> We capture a NULL pointer issue when resizing a corrupt ext4 image which
> is freshly clear resize_inode feature (not run e2fsck). It could be
> simply reproduced by following steps. The problem is because of the
> resize_inode feature was cleared, and it will convert the filesystem to
> meta_bg mode in ext4_resize_fs(), but the es->s_reserved_gdt_blocks was
> not reduced to zero, so could we mistakenly call reserve_backup_gdb()
> and passing an uninitialized resize_inode to it when adding new group
> descriptors.
> 
> [...]

Applied, thanks!

[1/1] ext4: add reserved GDT blocks check
      commit: 7dc0ff3a33ea92cefaf032a6d0de9314a9a5fb20

Best regards,
-- 
Theodore Ts'o <tytso@....edu>