Re: [PATCH v2] ext4: fix OOB read when checking dotdot dir

[Theodore Ts'o]

On Thu, 20 Mar 2025 15:46:49 +0000, Acs, Jakub wrote:
> Mounting a corrupted filesystem with directory which contains '.' dir
> entry with rec_len == block size results in out-of-bounds read (later
> on, when the corrupted directory is removed).
> 
> ext4_empty_dir() assumes every ext4 directory contains at least '.'
> and '..' as directory entries in the first data block. It first loads
> the '.' dir entry, performs sanity checks by calling ext4_check_dir_entry()
> and then uses its rec_len member to compute the location of '..' dir
> entry (in ext4_next_entry). It assumes the '..' dir entry fits into the
> same data block.
> 
> [...]

Applied, thanks!

[1/1] ext4: fix OOB read when checking dotdot dir
      commit: d5e206778e96e8667d3bde695ad372c296dc9353

Best regards,
-- 
Theodore Ts'o <tytso@xxxxxxx>