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radix-tree: fix sibling entry insertion

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The subtraction was the wrong way round, leading to undefined behaviour
(shift by an amount larger than the size of the type).

Signed-off-by: Matthew Wilcox <[email protected]>
Reviewed-by: Ross Zwisler <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Cc: Kirill Shutemov <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Neil Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Matthew Wilcox 2016-05-20 17:01:59 -07:00 • committed by Linus Torvalds
commit 3b8c00f684
1 changed files with 2 additions and 2 deletions
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4
lib/radix-tree.c
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@ -526,8 +526,8 @@ int __radix_tree_create(struct radix_tree_root *root, unsigned long index,
#ifdef CONFIG_RADIX_TREE_MULTIORDER
/* Insert pointers to the canonical entry */
if ((shift - order) > 0) {
int i, n = 1 << (shift - order);
if (order > shift) {
int i, n = 1 << (order - shift);
offset = offset & ~(n - 1);
slot = ptr_to_indirect(&node->slots[offset]);
for (i = 0; i < n; i++) {