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Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c105
1 files changed, 86 insertions, 19 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 2a42cc04466f..6d600a69fc9d 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -55,6 +55,13 @@ static struct buffer_head *ext4_append(handle_t *handle,
{
struct buffer_head *bh;
+ if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
+ ((inode->i_size >> 10) >=
+ EXT4_SB(inode->i_sb)->s_max_dir_size_kb))) {
+ *err = -ENOSPC;
+ return NULL;
+ }
+
*block = inode->i_size >> inode->i_sb->s_blocksize_bits;
bh = ext4_bread(handle, inode, *block, 1, err);
@@ -67,6 +74,12 @@ static struct buffer_head *ext4_append(handle_t *handle,
bh = NULL;
}
}
+ if (!bh && !(*err)) {
+ *err = -EIO;
+ ext4_error(inode->i_sb,
+ "Directory hole detected on inode %lu\n",
+ inode->i_ino);
+ }
return bh;
}
@@ -594,8 +607,11 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
u32 hash;
frame->bh = NULL;
- if (!(bh = ext4_bread (NULL,dir, 0, 0, err)))
+ if (!(bh = ext4_bread(NULL, dir, 0, 0, err))) {
+ if (*err == 0)
+ *err = ERR_BAD_DX_DIR;
goto fail;
+ }
root = (struct dx_root *) bh->b_data;
if (root->info.hash_version != DX_HASH_TEA &&
root->info.hash_version != DX_HASH_HALF_MD4 &&
@@ -696,8 +712,11 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
frame->entries = entries;
frame->at = at;
if (!indirect--) return frame;
- if (!(bh = ext4_bread (NULL,dir, dx_get_block(at), 0, err)))
+ if (!(bh = ext4_bread(NULL, dir, dx_get_block(at), 0, err))) {
+ if (!(*err))
+ *err = ERR_BAD_DX_DIR;
goto fail2;
+ }
at = entries = ((struct dx_node *) bh->b_data)->entries;
if (!buffer_verified(bh) &&
@@ -807,8 +826,15 @@ static int ext4_htree_next_block(struct inode *dir, __u32 hash,
*/
while (num_frames--) {
if (!(bh = ext4_bread(NULL, dir, dx_get_block(p->at),
- 0, &err)))
+ 0, &err))) {
+ if (!err) {
+ ext4_error(dir->i_sb,
+ "Directory hole detected on inode %lu\n",
+ dir->i_ino);
+ return -EIO;
+ }
return err; /* Failure */
+ }
if (!buffer_verified(bh) &&
!ext4_dx_csum_verify(dir,
@@ -839,12 +865,19 @@ static int htree_dirblock_to_tree(struct file *dir_file,
{
struct buffer_head *bh;
struct ext4_dir_entry_2 *de, *top;
- int err, count = 0;
+ int err = 0, count = 0;
dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
(unsigned long)block));
- if (!(bh = ext4_bread (NULL, dir, block, 0, &err)))
+ if (!(bh = ext4_bread(NULL, dir, block, 0, &err))) {
+ if (!err) {
+ err = -EIO;
+ ext4_error(dir->i_sb,
+ "Directory hole detected on inode %lu\n",
+ dir->i_ino);
+ }
return err;
+ }
if (!buffer_verified(bh) &&
!ext4_dirent_csum_verify(dir, (struct ext4_dir_entry *)bh->b_data))
@@ -1267,8 +1300,15 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q
return NULL;
do {
block = dx_get_block(frame->at);
- if (!(bh = ext4_bread(NULL, dir, block, 0, err)))
+ if (!(bh = ext4_bread(NULL, dir, block, 0, err))) {
+ if (!(*err)) {
+ *err = -EIO;
+ ext4_error(dir->i_sb,
+ "Directory hole detected on inode %lu\n",
+ dir->i_ino);
+ }
goto errout;
+ }
if (!buffer_verified(bh) &&
!ext4_dirent_csum_verify(dir,
@@ -1801,9 +1841,15 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
}
blocks = dir->i_size >> sb->s_blocksize_bits;
for (block = 0; block < blocks; block++) {
- bh = ext4_bread(handle, dir, block, 0, &retval);
- if(!bh)
+ if (!(bh = ext4_bread(handle, dir, block, 0, &retval))) {
+ if (!retval) {
+ retval = -EIO;
+ ext4_error(inode->i_sb,
+ "Directory hole detected on inode %lu\n",
+ inode->i_ino);
+ }
return retval;
+ }
if (!buffer_verified(bh) &&
!ext4_dirent_csum_verify(dir,
(struct ext4_dir_entry *)bh->b_data))
@@ -1860,8 +1906,15 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
entries = frame->entries;
at = frame->at;
- if (!(bh = ext4_bread(handle,dir, dx_get_block(frame->at), 0, &err)))
+ if (!(bh = ext4_bread(handle, dir, dx_get_block(frame->at), 0, &err))) {
+ if (!err) {
+ err = -EIO;
+ ext4_error(dir->i_sb,
+ "Directory hole detected on inode %lu\n",
+ dir->i_ino);
+ }
goto cleanup;
+ }
if (!buffer_verified(bh) &&
!ext4_dirent_csum_verify(dir, (struct ext4_dir_entry *)bh->b_data))
@@ -2149,9 +2202,7 @@ retry:
err = PTR_ERR(inode);
if (!IS_ERR(inode)) {
init_special_inode(inode, inode->i_mode, rdev);
-#ifdef CONFIG_EXT4_FS_XATTR
inode->i_op = &ext4_special_inode_operations;
-#endif
err = ext4_add_nondir(handle, dentry, inode);
}
ext4_journal_stop(handle);
@@ -2199,9 +2250,15 @@ retry:
inode->i_op = &ext4_dir_inode_operations;
inode->i_fop = &ext4_dir_operations;
inode->i_size = EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
- dir_block = ext4_bread(handle, inode, 0, 1, &err);
- if (!dir_block)
+ if (!(dir_block = ext4_bread(handle, inode, 0, 1, &err))) {
+ if (!err) {
+ err = -EIO;
+ ext4_error(inode->i_sb,
+ "Directory hole detected on inode %lu\n",
+ inode->i_ino);
+ }
goto out_clear_inode;
+ }
BUFFER_TRACE(dir_block, "get_write_access");
err = ext4_journal_get_write_access(handle, dir_block);
if (err)
@@ -2318,6 +2375,11 @@ static int empty_dir(struct inode *inode)
EXT4_ERROR_INODE(inode,
"error %d reading directory "
"lblock %u", err, lblock);
+ else
+ ext4_warning(inode->i_sb,
+ "bad directory (dir #%lu) - no data block",
+ inode->i_ino);
+
offset += sb->s_blocksize;
continue;
}
@@ -2362,7 +2424,7 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
struct ext4_iloc iloc;
int err = 0, rc;
- if (!ext4_handle_valid(handle))
+ if (!EXT4_SB(sb)->s_journal)
return 0;
mutex_lock(&EXT4_SB(sb)->s_orphan_lock);
@@ -2436,8 +2498,7 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
struct ext4_iloc iloc;
int err = 0;
- /* ext4_handle_valid() assumes a valid handle_t pointer */
- if (handle && !ext4_handle_valid(handle))
+ if (!EXT4_SB(inode->i_sb)->s_journal)
return 0;
mutex_lock(&EXT4_SB(inode->i_sb)->s_orphan_lock);
@@ -2456,7 +2517,7 @@ int ext4_orphan_del(handle_t *handle, struct inode *inode)
* transaction handle with which to update the orphan list on
* disk, but we still need to remove the inode from the linked
* list in memory. */
- if (sbi->s_journal && !handle)
+ if (!handle)
goto out;
err = ext4_reserve_inode_write(handle, inode, &iloc);
@@ -2826,9 +2887,15 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
goto end_rename;
}
retval = -EIO;
- dir_bh = ext4_bread(handle, old_inode, 0, 0, &retval);
- if (!dir_bh)
+ if (!(dir_bh = ext4_bread(handle, old_inode, 0, 0, &retval))) {
+ if (!retval) {
+ retval = -EIO;
+ ext4_error(old_inode->i_sb,
+ "Directory hole detected on inode %lu\n",
+ old_inode->i_ino);
+ }
goto end_rename;
+ }
if (!buffer_verified(dir_bh) &&
!ext4_dirent_csum_verify(old_inode,
(struct ext4_dir_entry *)dir_bh->b_data))
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.