linux-ext4 - Re: [PATCH] ext4: Forbid overflowing inode count when resizing

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Message-ID: <20180525165057.GC8197@thunk.org>
Date:   Fri, 25 May 2018 12:50:57 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org, Jaco Kroon <jaco@....co.za>,
        stable@...r.kernel.org
Subject: Re: [PATCH] ext4: Forbid overflowing inode count when resizing

On Thu, May 24, 2018 at 01:36:46PM +0200, Jan Kara wrote:
> ext4_resize_fs() has an off-by-one bug when checking whether growing of
> a filesystem will not overflow inode count. As a result it allows a
> filesystem with 8192 inodes per group to grow to 64TB which overflows
> inode count to 0 and makes filesystem unusable. Fix it.
> 
> CC: stable@...r.kernel.org
> Fixes: 3f8a6411fbada1fa482276591e037f3b1adcf55b
> Reported-by: Jaco Kroon <jaco@....co.za>
> Signed-off-by: Jan Kara <jack@...e.cz>

Applied, thanks.

				- Ted