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Message-ID: <20191127200015.GC22921@mit.edu> Date: Wed, 27 Nov 2019 15:00:15 -0500 From: "Theodore Y. Ts'o" <tytso@....edu> To: Jan Kara <jack@...e.cz> Cc: linux-ext4@...r.kernel.org, stable@...r.kernel.org Subject: Re: [PATCH] ext4: Fix ext4_empty_dir() for directories with holes 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@...r.kernel.org > Fixes: 4e19d6b65fb4 ("ext4: allow directory holes") > Signed-off-by: Jan Kara <jack@...e.cz> Thanks, applied. - Ted
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