commit a1e0873bd8ab79f64296d1103a4e9e7ee6a5bbb7
author Narayan Kamath <narayan@google.com> Fri Aug 19 15:26:24 2016 +0100
committer Adam Seaton <aseaton@google.com> Tue Sep 27 13:31:03 2016 -0700
tree c07d7b05a78f1ed30aeec172a8dd41ae1bc3a682
parent c95c72ec796254f98e12d108d6f6d0e06d01bcd3

IDN: Fix handling of long domain names.

Fix merge conflict into mnc-mr2-release
We were incorrectly using sizeof() to calculate the size of the
output array. Note that this change also changes the output size
to 512 to minimize behavioural differences (especially wrt. ICU
checks on sizes).

bug: 30765246
Change-Id: I5d28ddc45d2d6d2bed3e479ca195ed2779b906ed

luni/src/main/native/libcore_icu_NativeIDN.cpp

diff --git a/luni/src/main/native/libcore_icu_NativeIDN.cpp b/luni/src/main/native/libcore_icu_NativeIDN.cpp
index 43f3ce5..9786b9d 100644
--- a/luni/src/main/native/libcore_icu_NativeIDN.cpp
+++ b/luni/src/main/native/libcore_icu_NativeIDN.cpp
@@ -37,7 +37,8 @@
     if (src.get() == NULL) {
         return NULL;
     }
-    UChar dst[256];
+    static const size_t kDstSize = 512;
+    UChar dst[kDstSize];
     UErrorCode status = U_ZERO_ERROR;
 
     // We're stuck implementing IDNA-2003 for now since that's what we specify.
@@ -47,10 +48,10 @@
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
     size_t resultLength = toAscii
-        ? uidna_IDNToASCII(src.get(), src.size(), &dst[0], sizeof(dst), flags, NULL, &status)
-        : uidna_IDNToUnicode(src.get(), src.size(), &dst[0], sizeof(dst), flags, NULL, &status);
+        ? uidna_IDNToASCII(src.get(), src.size(), &dst[0], kDstSize, flags, NULL, &status)
+        : uidna_IDNToUnicode(src.get(), src.size(), &dst[0], kDstSize, flags, NULL, &status);
 #pragma GCC diagnostic pop
-
+    
     if (U_FAILURE(status)) {
         jniThrowException(env, "java/lang/IllegalArgumentException", u_errorName(status));
         return NULL;

luni/src/test/java/libcore/java/net/IDNTest.java

diff --git a/luni/src/test/java/libcore/java/net/IDNTest.java b/luni/src/test/java/libcore/java/net/IDNTest.java
index f01eca3..37f3505 100644
--- a/luni/src/test/java/libcore/java/net/IDNTest.java
+++ b/luni/src/test/java/libcore/java/net/IDNTest.java
@@ -37,4 +37,15 @@
         String longInput = makePunyString(512);
         assertEquals(longInput, IDN.toUnicode(longInput));
     }
+
+    // http://b/30765246
+    public void testLongDomainName() {
+        String label63 = "123456789-123456789-123456789-123456789-123456789-123456789-123";
+        String host255 = label63 + "." + label63 + "." + label63 + "." + label63;
+        try {
+            IDN.toASCII(host255.substring(3) + ".com");
+            fail();
+        } catch (IllegalArgumentException expected) {
+        }
+    }
 }