allowedips: prevent double read in kref

Blocks like:

    if (node_placement(*trie, key, cidr, bits, &node, lock)) {
        node->peer = peer;
        return 0;
    }

May result in a double read when adjusting the refcount, in the highly
unlikely case of LTO and an overly smart compiler.

While we're at it, replace rcu_assign_pointer(X, NULL); with
RCU_INIT_POINTER.

Reported-by: Jann Horn <jann@thejh.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

0 files changed, 0 insertions, 0 deletions