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From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Jan Kara <jack@suse.cz>
Cc: linux-ext4@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] ext4: Fix ext4_empty_dir() for directories with holes
Date: Wed, 27 Nov 2019 15:00:15 -0500
Message-ID: <20191127200015.GC22921@mit.edu> (raw)
In-Reply-To: <20191127131258.1163-1-jack@suse.cz>

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. Reorganize
> the loop to use 'offset' variable all the times instead of comparing
> pointers to current direntry with bh->b_data pointer. Also add more
> strict checking of '.' and '..' directory entries to avoid entering loop
> in possibly invalid state on corrupted filesystems.
> 
> References: CVE-2019-19037
> CC: stable@vger.kernel.org
> Fixes: 4e19d6b65fb4 ("ext4: allow directory holes")
> Signed-off-by: Jan Kara <jack@suse.cz>

Thanks, applied.

					- Ted

  parent reply index

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
2019-11-27 19:53   ` Theodore Y. Ts'o
2019-11-27 20:00 ` Theodore Y. Ts'o [this message]
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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