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From: "Theodore Ts'o" <>
To: Jan Kara <>
Cc:, Eric Whitney <>,,
	"Darrick J . Wong" <>
Subject: Re: [PATCH 3/3] ext4: Fix overflow in ext4_iomap_alloc()
Date: Wed, 16 Jun 2021 08:22:38 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Mon, Apr 12, 2021 at 12:23:33PM +0200, Jan Kara wrote:
> A code in iomap alloc may overblock block number when converting it to
> byte offset. Luckily this is mostly harmless as we will just use more
> expensive method of writing using unwritten extents even though we are
> writing beyond i_size.
> Fixes: 378f32bab371 ("ext4: introduce direct I/O write using iomap infrastructure")
> Signed-off-by: Jan Kara <>

This was part of the patch series "ext4: Fix data corruption when
extending DIO write races with buffered read" but which fixes an
unrelated problem.  The patch series was dropped in favor of a
different approach, but it looks like this patch is still applicable,
so I've applied with a minor typo fix in the commit description.

   		       	     	      - Ted

      parent reply	other threads:[~2021-06-16 12:22 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-12 10:23 [PATCH 0/3] ext4: Fix data corruption when extending DIO write races with buffered read Jan Kara
2021-04-12 10:23 ` [PATCH 1/3] iomap: Pass original DIO size to completion handler Jan Kara
2021-04-12 14:07   ` kernel test robot
2021-04-12 14:12   ` kernel test robot
2021-04-12 16:37   ` kernel test robot
2021-04-12 10:23 ` [PATCH 2/3] ext4: Fix occasional generic/418 failure Jan Kara
2021-04-12 21:50   ` Dave Chinner
2021-04-13  9:11     ` Jan Kara
2021-04-13 22:45       ` Dave Chinner
2021-04-14 11:56         ` Jan Kara
2021-04-12 10:23 ` [PATCH 3/3] ext4: Fix overflow in ext4_iomap_alloc() Jan Kara
2021-04-12 11:30   ` Matthew Wilcox
2021-06-16 12:22   ` Theodore Ts'o [this message]

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