linux-kernel - Re: [PATCH] ext4: fix possible overflow in ext4_trim

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Message-ID: <20101220123521.GH23626@thunk.org>
Date:	Mon, 20 Dec 2010 07:35:21 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	linux-kernel@...r.kernel.org, sandeen@...hat.com
Subject: Re: [PATCH] ext4: fix possible overflow in ext4_trim_fs()

On Thu, Nov 25, 2010 at 03:11:17PM +0100, Lukas Czerner wrote:
> When determining last group through ext4_get_group_no_and_offset() the
> result may be wrong in cases when range->start and range-len are too
> big, because it may overflow when summing up those two numbers.
> 
> Fix that by checking range->len and limit its value to
> ext4_blocks_count(). This commit was tested by myself with expected
> result.
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>

Added to the ext4 patch queue.  Thanks for the ping.

      	     	  		       	   - Ted
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