linux-kernel - [PATCH v3 1/3] mm/zswap: bugfix: memory leak when re-swapon

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Message-id: <000301ceb836$7b4a1340$71de39c0$%yang@samsung.com>
Date:	Mon, 23 Sep 2013 16:21:49 +0800
From:	Weijie Yang <weijie.yang@...sung.com>
To:	akpm@...ux-foundation.org
Cc:	sjenning@...ux.vnet.ibm.com, bob.liu@...cle.com,
	minchan@...nel.org, weijie.yang.kh@...il.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	d.j.shin@...sung.com, heesub.shin@...sung.com,
	kyungmin.park@...sung.com, hau.chen@...sung.com,
	bifeng.tong@...sung.com, rui.xie@...sung.com
Subject: [PATCH v3 1/3] mm/zswap: bugfix: memory leak when re-swapon

zswap_tree is not freed when swapoff, and it got re-kmalloc in swapon,
so memory-leak occurs.

Modify: free memory of zswap_tree in zswap_frontswap_invalidate_area().

Signed-off-by: Weijie Yang <weijie.yang@...sung.com>
Reviewed-by: Bob Liu <bob.liu@...cle.com>
Cc: Minchan Kim <minchan@...nel.org>
Cc: stable@...r.kernel.org
Acked-by: Seth Jennings <sjenning@...ux.vnet.ibm.com>
---
 mm/zswap.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/zswap.c b/mm/zswap.c
index deda2b6..cbd9578 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -816,6 +816,10 @@ static void zswap_frontswap_invalidate_area(unsigned type)
 	}
 	tree->rbroot = RB_ROOT;
 	spin_unlock(&tree->lock);
+
+	zbud_destroy_pool(tree->pool);
+	kfree(tree);
+	zswap_trees[type] = NULL;
 }
 
 static struct zbud_ops zswap_zbud_ops = {
-- 
1.7.10.4


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