linux-kernel - [PATCH 3.2 68/94] xfs: fix allocbt cursor leak in xfs_alloc_ag_vextent

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Message-ID: <lsq.1407170912.61097646@decadent.org.uk>
Date:	Mon, 04 Aug 2014 17:48:32 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Christoph Hellwig" <hch@....de>,
	"Dave Chinner" <dchinner@...hat.com>, "Ben Myers" <bpm@....com>,
	"Chris J Arges" <chris.j.arges@...onical.com>
Subject: [PATCH 3.2 68/94] xfs: fix allocbt cursor leak in xfs_alloc_ag_vextent_near

3.2.62-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Dave Chinner <dchinner@...hat.com>

commit 76d095388b040229ea1aad7dea45be0cfa20f589 upstream.

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@...onical.com>
Signed-off-by: Dave Chinner <dchinner@...hat.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Ben Myers <bpm@....com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/xfs/xfs_alloc.c | 1 +
 1 file changed, 1 insertion(+)

--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -1081,6 +1081,7 @@ restart:
 			goto restart;
 		}
 
+		xfs_btree_del_cursor(cnt_cur, XFS_BTREE_NOERROR);
 		trace_xfs_alloc_size_neither(args);
 		args->agbno = NULLAGBLOCK;
 		return 0;

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