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path: root/fs/btrfs/dir-item.c
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Diffstat (limited to 'fs/btrfs/dir-item.c')
-rw-r--r--fs/btrfs/dir-item.c45
1 files changed, 41 insertions, 4 deletions
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index f0cad5ae5be7..c62f02f6ae69 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -151,7 +151,7 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
ret = PTR_ERR(dir_item);
if (ret == -EEXIST)
goto second_insert;
- goto out;
+ goto out_free;
}
leaf = path->nodes[0];
@@ -170,7 +170,7 @@ second_insert:
/* FIXME, use some real flag for selecting the extra index */
if (root == root->fs_info->tree_root) {
ret = 0;
- goto out;
+ goto out_free;
}
btrfs_release_path(root, path);
@@ -180,7 +180,7 @@ second_insert:
name, name_len);
if (IS_ERR(dir_item)) {
ret2 = PTR_ERR(dir_item);
- goto out;
+ goto out_free;
}
leaf = path->nodes[0];
btrfs_cpu_key_to_disk(&disk_key, location);
@@ -192,7 +192,9 @@ second_insert:
name_ptr = (unsigned long)(dir_item + 1);
write_extent_buffer(leaf, name, name_ptr, name_len);
btrfs_mark_buffer_dirty(leaf);
-out:
+
+out_free:
+
btrfs_free_path(path);
if (ret)
return ret;
@@ -377,6 +379,9 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
leaf = path->nodes[0];
dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
+ if (verify_dir_item(root, leaf, dir_item))
+ return NULL;
+
total_len = btrfs_item_size_nr(leaf, path->slots[0]);
while (cur < total_len) {
this_len = sizeof(*dir_item) +
@@ -429,3 +434,35 @@ int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
}
return ret;
}
+
+int verify_dir_item(struct btrfs_root *root,
+ struct extent_buffer *leaf,
+ struct btrfs_dir_item *dir_item)
+{
+ u16 namelen = BTRFS_NAME_LEN;
+ u8 type = btrfs_dir_type(leaf, dir_item);
+
+ if (type >= BTRFS_FT_MAX) {
+ printk(KERN_CRIT "btrfs: invalid dir item type: %d\n",
+ (int)type);
+ return 1;
+ }
+
+ if (type == BTRFS_FT_XATTR)
+ namelen = XATTR_NAME_MAX;
+
+ if (btrfs_dir_name_len(leaf, dir_item) > namelen) {
+ printk(KERN_CRIT "btrfS: invalid dir item name len: %u\n",
+ (unsigned)btrfs_dir_data_len(leaf, dir_item));
+ return 1;
+ }
+
+ /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */
+ if (btrfs_dir_data_len(leaf, dir_item) > BTRFS_MAX_XATTR_SIZE(root)) {
+ printk(KERN_CRIT "btrfs: invalid dir item data len: %u\n",
+ (unsigned)btrfs_dir_data_len(leaf, dir_item));
+ return 1;
+ }
+
+ return 0;
+}