hardfork: fix get_earliest_ideal_height_for_version() to support non-existent versions

1 files changed, 8 insertions, 4 deletions

diff --git a/src/cryptonote_basic/hardfork.cpp b/src/cryptonote_basic/hardfork.cpp
index 95f1ecab9..aa6746304 100644
--- a/src/cryptonote_basic/hardfork.cpp
+++ b/src/cryptonote_basic/hardfork.cpp
@@ -379,11 +379,15 @@ uint8_t HardFork::get_ideal_version(uint64_t height) const
 
 uint64_t HardFork::get_earliest_ideal_height_for_version(uint8_t version) const
 {
-  for (unsigned int n = heights.size() - 1; n > 0; --n) {
-    if (heights[n].version <= version)
-      return heights[n].height;
+  uint64_t height = std::numeric_limits<uint64_t>::max();
+  for (auto i = heights.rbegin(); i != heights.rend(); ++i) {
+    if (i->version >= version) {
+      height = i->height;
+    } else {
+      break;
+    }
   }
-  return 0;
+  return height;
 }
 
 uint8_t HardFork::get_next_version() const