@@ -668,14 +668,15 @@ static int ext4_d_compare(const struct dentry *dentry, unsigned int len,
const char *str, const struct qstr *name)
{
struct qstr qstr = {.name = str, .len = len };
+ struct inode *inode = dentry->d_parent->d_inode;
- if (!IS_CASEFOLDED(dentry->d_parent->d_inode)) {
+ if (!IS_CASEFOLDED(inode) || !EXT4_SB(inode->i_sb)->s_encoding) {
if (len != name->len)
return -1;
return memcmp(str, name->name, len);
}
- return ext4_ci_compare(dentry->d_parent->d_inode, name, &qstr, false);
+ return ext4_ci_compare(inode, name, &qstr, false);
}
static int ext4_d_hash(const struct dentry *dentry, struct qstr *str)
@@ -685,7 +686,7 @@ static int ext4_d_hash(const struct dentry *dentry, struct qstr *str)
unsigned char *norm;
int len, ret = 0;
- if (!IS_CASEFOLDED(dentry->d_inode))
+ if (!IS_CASEFOLDED(dentry->d_inode) || !um)
return 0;
norm = kmalloc(PATH_MAX, GFP_ATOMIC);
@@ -280,7 +280,7 @@ int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
unsigned char *buff;
struct qstr qstr = {.name = name, .len = len };
- if (len && IS_CASEFOLDED(dir)) {
+ if (len && IS_CASEFOLDED(dir) && um) {
buff = kzalloc(sizeof(char) * PATH_MAX, GFP_KERNEL);
if (!buff)
return -ENOMEM;
@@ -5067,6 +5067,9 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
"iget: bogus i_mode (%o)", inode->i_mode);
goto bad_inode;
}
+ if (IS_CASEFOLDED(inode) && !ext4_has_feature_casefold(inode->i_sb))
+ ext4_error_inode(inode, function, line, 0,
+ "casefold flag without casefold feature");
brelse(iloc.bh);
unlock_new_inode(inode);
@@ -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
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> --- fs/ext4/dir.c | 7 ++++--- fs/ext4/hash.c | 2 +- fs/ext4/inode.c | 3 +++ fs/ext4/namei.c | 4 ++-- 4 files changed, 10 insertions(+), 6 deletions(-)