[3.0-stable PATCH 30/36] xfs: fix allocbt cursor leak in xfs_alloc_ag_vextent_near

[Mark Tinguely <tinguely@xxxxxxx>]

From: Dave Chinner <dchinner@xxxxxxxxxx>

Upstream commit: 76d095388b040229ea1aad7dea45be0cfa20f589

When we fail to find an matching extent near the requested extent
specification during a left-right distance search in
xfs_alloc_ag_vextent_near, we fail to free the original cursor that
we used to look up the XFS_BTNUM_CNT tree and hence leak it.

Reported-by: Chris J Arges <chris.j.arges@xxxxxxxxxxxxx>
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Ben Myers <bpm@xxxxxxx>
---
 fs/xfs/xfs_alloc.c |    1 +
 1 file changed, 1 insertion(+)

Index: b/fs/xfs/xfs_alloc.c
===================================================================
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -1086,6 +1086,7 @@ restart:
                        goto restart;
                }
 
+               xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR);
                trace_xfs_alloc_size_neither(args);
                args->agbno = NULLAGBLOCK;
                return 0;