linux-ext4 - Re: [PATCH 1/5] ext4: fix trim length underflow with small trim length.

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Date:	Mon, 11 Jul 2011 00:06:45 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Tao Ma <tm@....ma>
Cc:	linux-ext4@...r.kernel.org, Lukas Czerner <lczerner@...hat.com>
Subject: Re: [PATCH 1/5] ext4: fix trim length underflow with small trim
 length.

On Fri, Jul 01, 2011 at 11:27:52PM +0800, Tao Ma wrote:
> From: Tao Ma <boyu.mt@...bao.com>
> 
> In 0f0a25b, we adjust 'len' with s_first_data_block - start, but
> it could underflow in case blocksize=1K, fstrim_range.len=512 and
> fstrim_range.start = 0. In this case, when we run the code:
> len -= first_data_blk - start; len will be underflow to -1ULL.
> In the end, although we are safe that last_group check later will limit
> the trim to the whole volume, but that isn't what the user really want.
> 
> So this patch fix it. It also adds the check for 'start' like ext3 so that
> we can break immediately if the start is invalid.
> 
> Cc: Lukas Czerner <lczerner@...hat.com>
> Signed-off-by: Tao Ma <boyu.mt@...bao.com>

Added to the ext4 tree, thanks.

							- Ted
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