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ext4: correct encrypted dentry name hash when not casefolded

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commit 70dd7b573afeba9b8f8a33f2ae1e4a9a2ec8c1ec upstream.

EXT4_DIRENT_HASH and EXT4_DIRENT_MINOR_HASH will access struct
ext4_dir_entry_hash followed ext4_dir_entry. But there is no ext4_dir_entry_hash
followed when inode is encrypted and not casefolded

Signed-off-by: yao.ly <yao.ly@linux.alibaba.com>
Link: https://patch.msgid.link/1719816219-128287-1-git-send-email-yao.ly@linux.alibaba.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
yao.ly 2024-07-01 14:43:39 +08:00 • committed by Greg Kroah-Hartman
parent a02d7f5b24
commit 7b30d0b9f5
1 changed files with 11 additions and 3 deletions
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14
fs/ext4/dir.c
View file

@ -279,12 +279,20 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
struct fscrypt_str de_name =
FSTR_INIT(de->name,
de->name_len);
u32 hash;
u32 minor_hash;
if (IS_CASEFOLDED(inode)) {
hash = EXT4_DIRENT_HASH(de);
minor_hash = EXT4_DIRENT_MINOR_HASH(de);
} else {
hash = 0;
minor_hash = 0;
}
/* Directory is encrypted */
err = fscrypt_fname_disk_to_usr(inode,
EXT4_DIRENT_HASH(de),
EXT4_DIRENT_MINOR_HASH(de),
&de_name, &fstr);
hash, minor_hash, &de_name, &fstr);
de_name = fstr;
fstr.len = save_len;
if (err)