#
# Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
#
Add NULL checks to getBuffer calls
https://unicode-org.atlassian.net/browse/ICU-12378

--- icu/source/common/uts46.cpp.orig
+++ icu/source/common/uts46.cpp
@@ -929,7 +929,12 @@
     UBool disallowNonLDHDot=(options&UIDNA_USE_STD3_RULES)!=0;
     UBool isASCII=true;
     UBool onlyLDH=true;
-    const char16_t *label=dest.getBuffer()+labelStart;
+    const char16_t *l=dest.getBuffer();
+    if(l==nullptr) {
+        info.labelErrors|=UIDNA_ERROR_LABEL_TOO_LONG;
+        return 0;
+    }
+    const char16_t *label=l+labelStart;
     const char16_t *limit=label+labelLength;
     // Start after the initial "xn--".
     // Ok to cast away const because we own the UnicodeString.