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Commit 3d6b5c3b authored by Tsutomu Itoh's avatar Tsutomu Itoh Committed by Chris Mason
Browse files

Btrfs: check return value of ulist_alloc() properly 



ulist_alloc() has the possibility of returning NULL.
So, it is necessary to check the return value.

Signed-off-by: default avatarTsutomu Itoh <t-itoh@jp.fujitsu.com>
parent f54fb859

fs/btrfs/qgroup.c

+8 −0
Original line number Diff line number Diff line
@@ -1469,6 +1469,10 @@ int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes) 
	 * be exceeded

	 */

	ulist = ulist_alloc(GFP_ATOMIC);

	if (!ulist) {

		ret = -ENOMEM;

		goto out;

	}

	ulist_add(ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC);

	ULIST_ITER_INIT(&uiter);

	while ((unode = ulist_next(ulist, &uiter))) {
@@ -1541,6 +1545,10 @@ void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes) 
		goto out;



	ulist = ulist_alloc(GFP_ATOMIC);

	if (!ulist) {

		btrfs_std_error(fs_info, -ENOMEM);

		goto out;

	}

	ulist_add(ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC);

	ULIST_ITER_INIT(&uiter);

	while ((unode = ulist_next(ulist, &uiter))) {