linux-kernel - [PATCH 11/30] radix-tree: Fix deleting a multi-order entry through an alias

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Date:	Wed,  6 Apr 2016 17:21:20 -0400
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
	Jan Kara <jack@...e.com>, Neil Brown <neilb@...e.de>
Subject: [PATCH 11/30] radix-tree: Fix deleting a multi-order entry through an alias

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_sibling_offset() to find the right slot.

Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
---
 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 42a0492b2ba2..554986599c63 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1557,7 +1557,7 @@ void *radix_tree_delete_item(struct radix_tree_root *root,
 		return entry;
 	}
 
-	offset = index & RADIX_TREE_MAP_MASK;
+	offset = get_sibling_offset(node, slot);
 
 	/*
 	 * Clear all tags associated with the item to be deleted.
-- 
2.8.0.rc3