[PATCH 1/7] xfs: rework refcount cow recovery error handling

["Darrick J. Wong" <darrick.wong@oracle.com>]

The error handling in xfs_refcount_recover_cow_leftovers is confused
and can potentially leak memory, so rework it to release resources
correctly on error.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reported-by: Brian Foster <bfoster@redhat.com>
---
 fs/xfs/libxfs/xfs_refcount.c |   18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)


diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c
index 56bfef1..87f00df 100644
--- a/fs/xfs/libxfs/xfs_refcount.c
+++ b/fs/xfs/libxfs/xfs_refcount.c
@@ -1643,7 +1643,7 @@ xfs_refcount_recover_cow_leftovers(
 	error = xfs_btree_query_range(cur, &low, &high,
 			xfs_refcount_recover_extent, &debris);
 	if (error)
-		goto out_error;
+		goto out_cursor;
 	xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 	xfs_buf_relse(agbp);
 
@@ -1675,26 +1675,22 @@ xfs_refcount_recover_cow_leftovers(
 
 		error = xfs_trans_commit(tp);
 		if (error)
-			goto out_cancel;
+			goto out_free;
 	}
-	goto out_free;
+	return 0;
 
 out_defer:
 	xfs_defer_cancel(&dfops);
-out_cancel:
 	xfs_trans_cancel(tp);
-
+	goto out_free;
+out_cursor:
+	xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+	xfs_buf_relse(agbp);
 out_free:
 	/* Free the leftover list */
 	list_for_each_entry_safe(rr, n, &debris, rr_list) {
 		list_del(&rr->rr_list);
 		kmem_free(rr);
 	}
-
-	return error;
-
-out_error:
-	xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
-	xfs_buf_relse(agbp);
 	return error;
 }