radix-tree: fix radix_tree_create for sibling entries
authorMatthew Wilcox <willy@linux.intel.com>
Sat, 21 May 2016 00:02:44 +0000 (17:02 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 21 May 2016 00:58:30 +0000 (17:58 -0700)
commit8a14f4d8328cc8615f8a5487c4173f36a8314796
treedf71c04e61341c3d21acc8e2786af46759aad703
parent0fc9b8ca2b1df4948e9516697b1cf12f030968bd
radix-tree: fix radix_tree_create for sibling entries

If the radix tree user attempted to insert a colliding entry with an
existing multiorder entry, then radix_tree_create() could encounter a
sibling entry when walking down the tree to look for a slot.  Use
radix_tree_descend() to fix the problem, and add a test-case to make
sure the problem doesn't come back in future.

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>
lib/radix-tree.c
tools/testing/radix-tree/multiorder.c