diff options
| author | Jan Kara <jack@suse.cz> | 2020-07-31 19:21:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-26 11:40:52 +0300 |
| commit | 2bc54ba65fdc2625f7c093d03d9a140cd1b12d13 (patch) | |
| tree | 55ae1edcee499893b6df51b76580f8b5ed7c6e2b /fs/ext4 | |
| parent | 59af0759bd46e2da3266bfbb6d74ba306109bdf9 (diff) | |
| download | linux-2bc54ba65fdc2625f7c093d03d9a140cd1b12d13.tar.xz | |
ext4: fix checking of directory entry validity for inline directories
commit 7303cb5bfe845f7d43cd9b2dbd37dbb266efda9b upstream.
ext4_search_dir() and ext4_generic_delete_entry() can be called both for
standard director blocks and for inline directories stored inside inode
or inline xattr space. For the second case we didn't call
ext4_check_dir_entry() with proper constraints that could result in
accepting corrupted directory entry as well as false positive filesystem
errors like:
EXT4-fs error (device dm-0): ext4_search_dir:1395: inode #28320400:
block 113246792: comm dockerd: bad entry in directory: directory entry too
close to block end - offset=0, inode=28320403, rec_len=32, name_len=8,
size=4096
Fix the arguments passed to ext4_check_dir_entry().
Fixes: 109ba779d6cc ("ext4: check for directory entries too close to block end")
CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20200731162135.8080-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/namei.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index a564d0289a70..0218b1407abb 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -1392,8 +1392,8 @@ int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size, ext4_match(dir, fname, de)) { /* found a match - just to be sure, do * a full check */ - if (ext4_check_dir_entry(dir, NULL, de, bh, bh->b_data, - bh->b_size, offset)) + if (ext4_check_dir_entry(dir, NULL, de, bh, search_buf, + buf_size, offset)) return -1; *res_dir = de; return 1; @@ -2462,7 +2462,7 @@ int ext4_generic_delete_entry(handle_t *handle, de = (struct ext4_dir_entry_2 *)entry_buf; while (i < buf_size - csum_size) { if (ext4_check_dir_entry(dir, NULL, de, bh, - bh->b_data, bh->b_size, i)) + entry_buf, buf_size, i)) return -EFSCORRUPTED; if (de == de_del) { if (pde) |