ext/hnswlib/src/bruteforce.h in hnswlib-0.6.0 vs ext/hnswlib/src/bruteforce.h in hnswlib-0.6.1

@@ -27,11 +27,11 @@
                 std::runtime_error("Not enough memory: BruteforceSearch failed to allocate data");
             cur_element_count = 0;
         }
 
         ~BruteforceSearch() {
-            free(data_);
+            if (data_) free(data_);
         }
 
         char *data_;
         size_t maxelements_;
         size_t cur_element_count;
@@ -127,9 +127,13 @@
 
         void loadIndex(const std::string &location, SpaceInterface<dist_t> *s) {
 
 
             std::ifstream input(location, std::ios::binary);
+
+            if (!input.is_open())
+                throw std::runtime_error("Cannot open file");
+
             std::streampos position;
 
             readBinaryPOD(input, maxelements_);
             readBinaryPOD(input, size_per_element_);
             readBinaryPOD(input, cur_element_count);