[PATCH 4.4 092/342] Btrfs: fix transaction handle leak on failure to create hard link

From: Greg Kroah-Hartman
Date: Tue Mar 01 2016 - 20:20:51 EST


4.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Filipe Manana <fdmanana@xxxxxxxx>

commit 271dba4521aed0c37c063548f876b49f5cd64b2e upstream.

If we failed to create a hard link we were not always releasing the
the transaction handle we got before, resulting in a memory leak and
preventing any other tasks from being able to commit the current
transaction.
Fix this by always releasing our transaction handle.

Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx>
Reviewed-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/btrfs/inode.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -6493,7 +6493,7 @@ out_unlock_inode:
static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
- struct btrfs_trans_handle *trans;
+ struct btrfs_trans_handle *trans = NULL;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct inode *inode = d_inode(old_dentry);
u64 index;
@@ -6519,6 +6519,7 @@ static int btrfs_link(struct dentry *old
trans = btrfs_start_transaction(root, 5);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
+ trans = NULL;
goto fail;
}

@@ -6552,9 +6553,10 @@ static int btrfs_link(struct dentry *old
btrfs_log_new_name(trans, inode, NULL, parent);
}

- btrfs_end_transaction(trans, root);
btrfs_balance_delayed_items(root);
fail:
+ if (trans)
+ btrfs_end_transaction(trans, root);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);