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From: "Theodore Y. Ts'o" <>
To: Jan Kara <>
Subject: Re: [PATCH] ext4: Fix ext4_empty_dir() for directories with holes
Date: Wed, 27 Nov 2019 14:44:15 -0500
Message-ID: <> (raw)
In-Reply-To: <>

On Wed, Nov 27, 2019 at 02:12:58PM +0100, Jan Kara wrote:
> Function ext4_empty_dir() doesn't correctly handle directories with
> holes and crashes on bh->b_data dereference when bh is NULL....

Hi Jan,

Thanks for the patch.

However, it looks like we're still vulnerable to the first block of
the directory being NULL?

> @@ -2833,19 +2833,25 @@ bool ext4_empty_dir(struct inode *inode)
>  		return true;
>  	de = (struct ext4_dir_entry_2 *) bh->b_data;

						- Ted

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Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27 13:12 Jan Kara
2019-11-27 19:44 ` Theodore Y. Ts'o [this message]
2019-11-27 19:53   ` Theodore Y. Ts'o
2019-11-27 20:00 ` Theodore Y. Ts'o
2019-12-01 15:13 ` [ext4] 3d487697d2: BUG:unable_to_handle_page_fault_for_address kernel test robot
2019-12-02 11:34   ` Jan Kara

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