Commit 381cf658 authored by David Sterba's avatar David Sterba
Browse files

btrfs: fix leak of path in btrfs_find_item 



If btrfs_find_item is called with NULL path it allocates one locally but
does not free it. Affected paths are inserting an orphan item for a file
and for a subvol root.

Move the path allocation to the callers.

CC: <stable@vger.kernel.org> # 3.14+
Fixes: 3f870c28 ("btrfs: expand btrfs_find_item() to include find_orphan_item functionality")
Signed-off-by: default avatarDavid Sterba <dsterba@suse.cz>
parent eaa27f34

fs/btrfs/ctree.c

+4 −13
Original line number Diff line number Diff line
@@ -2609,32 +2609,23 @@ static int key_search(struct extent_buffer *b, struct btrfs_key *key, 
	return 0;

}



int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *found_path,

int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,

		u64 iobjectid, u64 ioff, u8 key_type,

		struct btrfs_key *found_key)

{

	int ret;

	struct btrfs_key key;

	struct extent_buffer *eb;

	struct btrfs_path *path;



	ASSERT(path);



	key.type = key_type;

	key.objectid = iobjectid;

	key.offset = ioff;



	if (found_path == NULL) {

		path = btrfs_alloc_path();

		if (!path)

			return -ENOMEM;

	} else

		path = found_path;



	ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0);

	if ((ret < 0) || (found_key == NULL)) {

		if (path != found_path)

			btrfs_free_path(path);

	if ((ret < 0) || (found_key == NULL))

		return ret;

	}



	eb = path->nodes[0];

	if (ret && path->slots[0] >= btrfs_header_nritems(eb)) {

fs/btrfs/disk-io.c

+8 −1
Original line number Diff line number Diff line
@@ -1630,6 +1630,7 @@ struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, 
				     bool check_ref)

{

	struct btrfs_root *root;

	struct btrfs_path *path;

	int ret;



	if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
@@ -1669,8 +1670,14 @@ again: 
	if (ret)

		goto fail;



	ret = btrfs_find_item(fs_info->tree_root, NULL, BTRFS_ORPHAN_OBJECTID,

	path = btrfs_alloc_path();

	if (!path) {

		ret = -ENOMEM;

		goto fail;

	}

	ret = btrfs_find_item(fs_info->tree_root, path, BTRFS_ORPHAN_OBJECTID,

			location->objectid, BTRFS_ORPHAN_ITEM_KEY, NULL);

	btrfs_free_path(path);

	if (ret < 0)

		goto fail;

	if (ret == 0)

fs/btrfs/tree-log.c

+10 −1
Original line number Diff line number Diff line
@@ -1257,10 +1257,19 @@ static int insert_orphan_item(struct btrfs_trans_handle *trans, 
			      struct btrfs_root *root, u64 offset)

{

	int ret;

	ret = btrfs_find_item(root, NULL, BTRFS_ORPHAN_OBJECTID,

	struct btrfs_path *path;



	path = btrfs_alloc_path();

	if (!path)

		return -ENOMEM;



	ret = btrfs_find_item(root, path, BTRFS_ORPHAN_OBJECTID,

			offset, BTRFS_ORPHAN_ITEM_KEY, NULL);

	if (ret > 0)

		ret = btrfs_insert_orphan_item(trans, root, offset);



	btrfs_free_path(path);



	return ret;

}

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