]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
ext4: fix BUG_ON() when directory entry has invalid rec_len
authorLuís Henriques <lhenriques@suse.de>
Wed, 12 Oct 2022 13:13:30 +0000 (14:13 +0100)
committerTheodore Ts'o <tytso@mit.edu>
Sun, 6 Nov 2022 05:07:49 +0000 (01:07 -0400)
commit17a0bc9bd697f75cfdf9b378d5eb2d7409c91340
tree1170b3ffacf9685e14a97b6301776d2e4d2e2764
parent9a8c5b0d061554fedd7dbe894e63aa34d0bac7c4
ext4: fix BUG_ON() when directory entry has invalid rec_len

The rec_len field in the directory entry has to be a multiple of 4.  A
corrupted filesystem image can be used to hit a BUG() in
ext4_rec_len_to_disk(), called from make_indexed_dir().

 ------------[ cut here ]------------
 kernel BUG at fs/ext4/ext4.h:2413!
 ...
 RIP: 0010:make_indexed_dir+0x53f/0x5f0
 ...
 Call Trace:
  <TASK>
  ? add_dirent_to_buf+0x1b2/0x200
  ext4_add_entry+0x36e/0x480
  ext4_add_nondir+0x2b/0xc0
  ext4_create+0x163/0x200
  path_openat+0x635/0xe90
  do_filp_open+0xb4/0x160
  ? __create_object.isra.0+0x1de/0x3b0
  ? _raw_spin_unlock+0x12/0x30
  do_sys_openat2+0x91/0x150
  __x64_sys_open+0x6c/0xa0
  do_syscall_64+0x3c/0x80
  entry_SYSCALL_64_after_hwframe+0x46/0xb0

The fix simply adds a call to ext4_check_dir_entry() to validate the
directory entry, returning -EFSCORRUPTED if the entry is invalid.

CC: stable@kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216540
Signed-off-by: Luís Henriques <lhenriques@suse.de>
Link: https://lore.kernel.org/r/20221012131330.32456-1-lhenriques@suse.de
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
fs/ext4/namei.c