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| author | Matthew Wilcox <willy@linux.intel.com> | 2016-05-21 02:01:59 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-05-21 02:58:30 +0200 |
| commit | 3b8c00f68405e9c037a6d8ae0d5d9da7f8a34e6a (patch) | |
| tree | 2669fd1498aa7895abeb85452e82399b91ac78ea | |
| parent | radix-tree: add missing sibling entry functionality (diff) | |
| download | linux-3b8c00f68405e9c037a6d8ae0d5d9da7f8a34e6a.tar.xz linux-3b8c00f68405e9c037a6d8ae0d5d9da7f8a34e6a.zip | |
radix-tree: fix sibling entry insertion
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 <willy@linux.intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com>
Cc: Jan Kara <jack@suse.com>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | lib/radix-tree.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/radix-tree.c b/lib/radix-tree.c index 585965afc808..c0366d1d2613 100644 --- a/lib/radix-tree.c +++ b/lib/radix-tree.c @@ -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++) { |