diff options
| author | Theodore Ts'o <tytso@mit.edu> | 2019-09-03 01:43:17 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-09-03 01:43:17 -0400 |
| commit | 6456ca6520ab6c9aec589b4640169cd6da378c68 (patch) | |
| tree | fd571eddedc34f63bc84e72e6c6c190ec0056be0 /fs/ext4/namei.c | |
| parent | 9ba55543fc0c6bb1cf8edd63be8802d9ab7e1202 (diff) | |
ext4: fix kernel oops caused by spurious casefold flag
If an directory has the a casefold flag set without the casefold
feature set, s_encoding will not be initialized, and this will cause
the kernel to dereference a NULL pointer. In addition to adding
checks to avoid these kernel oops, attempts to load inodes with the
casefold flag when the casefold feature is not enable will cause the
file system to be declared corrupted.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/namei.c')
| -rw-r--r-- | fs/ext4/namei.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 129029534075..a427d2031a8d 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -1312,7 +1312,7 @@ void ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname, { int len; - if (!IS_CASEFOLDED(dir)) { + if (!IS_CASEFOLDED(dir) || !EXT4_SB(dir->i_sb)->s_encoding) { cf_name->name = NULL; return; } @@ -2183,7 +2183,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry, #ifdef CONFIG_UNICODE if (ext4_has_strict_mode(sbi) && IS_CASEFOLDED(dir) && - utf8_validate(sbi->s_encoding, &dentry->d_name)) + sbi->s_encoding && utf8_validate(sbi->s_encoding, &dentry->d_name)) return -EINVAL; #endif |