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Btrfs: check return value of ulist_alloc() properly

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

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
This commit is contained in:
Tsutomu Itoh 2012-09-06 00:18:10 -06:00 committed by Chris Mason
parent f54fb859da
commit 3d6b5c3b5c
1 changed files with 8 additions and 0 deletions
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8
fs/btrfs/qgroup.c
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@ -1469,6 +1469,10 @@ int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes)
* be exceeded * be exceeded
*/ */
ulist = ulist_alloc(GFP_ATOMIC); ulist = ulist_alloc(GFP_ATOMIC);
if (!ulist) {
ret = -ENOMEM;
goto out;
}
ulist_add(ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC); ulist_add(ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC);
ULIST_ITER_INIT(&uiter); ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(ulist, &uiter))) { while ((unode = ulist_next(ulist, &uiter))) {
@ -1541,6 +1545,10 @@ void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes)
goto out; goto out;
ulist = ulist_alloc(GFP_ATOMIC); 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_add(ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC);
ULIST_ITER_INIT(&uiter); ULIST_ITER_INIT(&uiter);
while ((unode = ulist_next(ulist, &uiter))) { while ((unode = ulist_next(ulist, &uiter))) {