Ensure that integer parsing correctly handles non-zero fractional data

Author: tannergooding

src/libraries/System.Private.CoreLib/src/System/Number.Parsing.cs

@@ -120,7 +120,7 @@ private static unsafe bool TryNumberBufferToBinaryInteger<TInteger>(ref NumberBu
 
             int i = number.Scale;
 
-            if ((i > TInteger.MaxDigitCount) || (i < number.DigitsCount) || (!TInteger.IsSigned && number.IsNegative))
+            if ((i > TInteger.MaxDigitCount) || (i < number.DigitsCount) || (!TInteger.IsSigned && number.IsNegative) || number.HasNonZeroTail)
             {
                 return false;
             }

src/libraries/System.Runtime/tests/System.Runtime.Tests/System/Int32Tests.cs

@@ -663,6 +663,46 @@ public static IEnumerable<object[]> Parse_Invalid_TestData()
             yield return new object[] { "2147483649-", NumberStyles.AllowTrailingSign, null, typeof(OverflowException) };
             yield return new object[] { "(2147483649)", NumberStyles.AllowParentheses, null, typeof(OverflowException) };
             yield return new object[] { "2E10", NumberStyles.AllowExponent, null, typeof(OverflowException) };
+
+            // Test trailing non zeros
+
+            yield return new object[] { "-9223372036854775808.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "-2147483648.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "-32768.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "-128.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "127.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "255.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "32767.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "65535.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "2147483647.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "4294967295.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "9223372036854775807.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "18446744073709551615.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+
+            yield return new object[] { "-9223372036854775808.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "-2147483648.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "-32768.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "-128.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "127.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "255.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "32767.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "65535.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "2147483647.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "4294967295.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "9223372036854775807.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "18446744073709551615.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+
+            yield return new object[] { "3.001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "3.000000001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "3.0000000001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "3.00000000001", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+
+            yield return new object[] { "3.100", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "3.100000000", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "3.1000000000", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+            yield return new object[] { "3.10000000000", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
+
+            yield return new object[] { "2147483646.1", NumberStyles.Number, CultureInfo.InvariantCulture, typeof(OverflowException) };
         }
 
         [Theory]