fix a possible buffer overflow and division by 0

Author: cen1

src/bncsutil/cdkeydecoder.cpp

@@ -140,7 +140,8 @@ CDKeyDecoder::CDKeyDecoder(const char* cdKey, size_t keyLength) {
     cdkey = new char[keyLength + 1];
     initialized = 1;
     keyLen = keyLength;
-    strcpy(cdkey, cdKey);
+    memcpy(cdkey, cdKey, keyLength);
+    cdkey[keyLength] = '\0';
 
     switch (keyType) {
         case KEY_STARCRAFT:

src/bncsutil/checkrevision.cpp

@@ -291,6 +291,7 @@ MEXP(int) checkRevision(const char* formula, const char* files[], int numFiles,
                         break;
                     case '/':
                         // well, you never know
+                        if (values[ovs2[k]] == 0) return 0;
                         values[ovd[k]] = values[ovs1[k]] / values[ovs2[k]];
                         break;
                     default: