From a4fdb61e81e73991d919ff0396d256e9e67d2475 Mon Sep 17 00:00:00 2001
From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Thu, 8 Aug 2013 13:04:17 +0800
Subject: Btrfs: fix possible memory leak in find_parent_nodes()

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 980e85a..ae798c1 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -911,7 +911,6 @@ again:
 
 	while (!list_empty(&prefs)) {
 		ref = list_first_entry(&prefs, struct __prelim_ref, list);
-		list_del(&ref->list);
 		WARN_ON(ref->count < 0);
 		if (ref->count && ref->root_id && ref->parent == 0) {
 			/* no parent == root of tree */
@@ -956,6 +955,7 @@ again:
 				eie->next = ref->inode_list;
 			}
 		}
+		list_del(&ref->list);
 		kfree(ref);
 	}
 
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