From 83ddc942c1629d67b9897ba8be8632035527c6fc Mon Sep 17 00:00:00 2001 From: Javier Smooth Date: Sun, 5 Apr 2015 04:39:09 -0700 Subject: handle unlikely rounding up after sqrt --- src/cryptonote_core/blockchain_storage.cpp | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/cryptonote_core/blockchain_storage.cpp b/src/cryptonote_core/blockchain_storage.cpp index a5e19b061..d59fc7a58 100644 --- a/src/cryptonote_core/blockchain_storage.cpp +++ b/src/cryptonote_core/blockchain_storage.cpp @@ -1086,6 +1086,9 @@ bool blockchain_storage::get_random_outs_for_amounts(const COMMAND_RPC_GET_RANDO uint64_t r = crypto::rand() % ((uint64_t)1 << 53); double frac = std::sqrt((double)r / ((uint64_t)1 << 53)); size_t i = (size_t)(frac*up_index_limit); + // just in case rounding up to 1 occurs after sqrt + if (i == up_index_limit) + --i; if(used.count(i)) continue; bool added = add_out_to_get_random_outs(amount_outs, result_outs, amount, i); -- cgit v1.2.3