[PATCH v2 11/29] radix-tree: Fix deleting a multi-order entry through an alias

[Matthew Wilcox]

If we deleted an entry through an index which looked up a sibling
pointer, we'd end up zeroing out the wrong slots in the node.
Use get_slot_offset() to find the right slot.

Signed-off-by: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Reviewed-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
---
 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 c0366d1..b3364b9 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1558,7 +1558,7 @@ void *radix_tree_delete_item(struct radix_tree_root *root,
 		return entry;
 	}
 
-	offset = index & RADIX_TREE_MAP_MASK;
+	offset = get_slot_offset(node, slot);
 
 	/*
 	 * Clear all tags associated with the item to be deleted.
-- 
2.8.0.rc3