+ radix-tree-get_slot_offset-returns-invalid-offset-when-parent-is-null.patch added to -mm tree

+ radix-tree-get_slot_offset-returns-invalid-offset-when-parent-is-null.patch added to -mm tree

[akpm]

The patch titled
     Subject: radix-tree: get_slot_offset() returns invalid offset when parent is NULL
has been added to the -mm tree.  Its filename is
     radix-tree-get_slot_offset-returns-invalid-offset-when-parent-is-null.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/radix-tree-get_slot_offset-returns-invalid-offset-when-parent-is-null.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/radix-tree-get_slot_offset-returns-invalid-offset-when-parent-is-null.patch

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------------------------------------------------------
From: Wei Yang <richard.weiyang@gmail.com>
Subject: radix-tree: get_slot_offset() returns invalid offset when parent is NULL

Needs new changelog.  And maybe a -stable backport?

Link: http://lkml.kernel.org/r/20171010025201.5895-1-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/radix-tree.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN lib/radix-tree.c~radix-tree-get_slot_offset-returns-invalid-offset-when-parent-is-null lib/radix-tree.c
--- a/lib/radix-tree.c~radix-tree-get_slot_offset-returns-invalid-offset-when-parent-is-null
+++ a/lib/radix-tree.c
@@ -119,7 +119,7 @@ bool is_sibling_entry(const struct radix
 static inline unsigned long
 get_slot_offset(const struct radix_tree_node *parent, void __rcu **slot)
 {
-	return slot - parent->slots;
+	return parent ? (slot - parent->slots):0;
 }
 
 static unsigned int radix_tree_descend(const struct radix_tree_node *parent,
_

Patches currently in -mm which might be from richard.weiyang@gmail.com are

radix-tree-get_slot_offset-returns-invalid-offset-when-parent-is-null.patch
mm-page_alloc-return-0-in-case-this-node-has-no-page-within-the-zone.patch