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btrfs: qgroup: Fix possible leak in btrfs_add_qgroup_relation()

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Commit 9c8b35b1ba ("btrfs: quota: Automatically update related qgroups or
mark INCONSISTENT flags when assigning/deleting a qgroup relations.")
introduced the allocation of a temporary ulist in function
btrfs_add_qgroup_relation() and added the corresponding cleanup to the out
path. However, the allocation was introduced before the src/dst level check
that directly returns. Fix the possible leakage of the ulist by moving the
allocation after the input validation. Detected by Coverity CID 1295988.

Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Christian Engelmayer 2015-05-02 17:19:55 +02:00 • committed by Chris Mason
parent 35c766425a
commit ab3680dd18
1 changed files with 4 additions and 4 deletions
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8
fs/btrfs/qgroup.c
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@ -1115,14 +1115,14 @@ int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans,
struct ulist *tmp; struct ulist *tmp;
int ret = 0; int ret = 0;
tmp = ulist_alloc(GFP_NOFS);
if (!tmp)
return -ENOMEM;
/* Check the level of src and dst first */ /* Check the level of src and dst first */
if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst)) if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst))
return -EINVAL; return -EINVAL;
tmp = ulist_alloc(GFP_NOFS);
if (!tmp)
return -ENOMEM;
mutex_lock(&fs_info->qgroup_ioctl_lock); mutex_lock(&fs_info->qgroup_ioctl_lock);
quota_root = fs_info->quota_root; quota_root = fs_info->quota_root;
if (!quota_root) { if (!quota_root) {