[PATCH] radix-tree: Fix private list warnings

[Matthew Wilcox]

The newly introduced warning in radix_tree_free_nodes() was testing the
wrong variable; it should have been 'old' instead of 'node'.

Fixes: ea07b862ac8e ("mm: workingset: fix use-after-free in shadow node shrinker")
Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
 lib/radix-tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 0b92d605fb69..84812a9fb16f 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -769,7 +769,7 @@ static void radix_tree_free_nodes(struct radix_tree_node *node)
 			struct radix_tree_node *old = child;
 			offset = child->offset + 1;
 			child = child->parent;
-			WARN_ON_ONCE(!list_empty(&node->private_list));
+			WARN_ON_ONCE(!list_empty(&old->private_list));
 			radix_tree_node_free(old);
 			if (old == entry_to_node(node))
 				return;
-- 
2.11.0