Fix ubsan errors in VDisk

1 files changed, 4 insertions, 3 deletions

diff --git a/library/cpp/actors/util/rc_buf.h b/library/cpp/actors/util/rc_buf.h
index 23d9ad4881e..8a6b8cd6071 100644
--- a/library/cpp/actors/util/rc_buf.h
+++ b/library/cpp/actors/util/rc_buf.h
@@ -121,10 +121,11 @@ public:
 
 private:
     static int Compare(const TContiguousSpan& x, const TContiguousSpan& y) {
-        if (int res = std::memcmp(x.data(), y.data(), std::min(x.size(), y.size())); res) {
-            return res;
+        int res = 0;
+        if (const size_t common = std::min(x.size(), y.size())) {
+            res = std::memcmp(x.data(), y.data(), common);
         }
-        return x.size() - y.size();
+        return res ? res : x.size() - y.size();
     }
 };