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Message-ID: <20191127194415.GA22921@mit.edu> Date: Wed, 27 Nov 2019 14:44:15 -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.... 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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