XmlReader.Create(Stream) method sometimes throws IndexOutOfRangeException (the documentation says that it can only throw ArgumentNullException and SecurityException). Here's the full program that reproduces this:
using System.IO;
using System.Xml;
namespace Test
{
public class Program
{
public static void Main(string[] args)
{
var b = new byte[] { 60, 0, 0, 0, 0, 34, 1, 0, 62, 100, 60, 47, 97, 62, 10 };
XmlReader.Create(new MemoryStream(b));
}
}
}
The stack trace:
Exception has occurred: CLR/System.IndexOutOfRangeException
An unhandled exception of type 'System.IndexOutOfRangeException' occurred in System.Private.Xml.dll: 'Index was outside the bounds of the array.'
at System.Xml.Ucs4Decoder.Ucs4ToUTF16(UInt32 code, Char[] chars, Int32 charIndex)
at System.Xml.Ucs4Decoder4321.GetFullChars(Byte[] bytes, Int32 byteIndex, Int32 byteCount, Char[] chars, Int32 charIndex)
at System.Xml.Ucs4Decoder.Convert(Byte[] bytes, Int32 byteIndex, Int32 byteCount, Char[] chars, Int32 charIndex, Int32 charCount, Boolean flush, Int32& bytesUsed, Int32& charsUsed, Boolean& completed)
at System.Xml.XmlTextReaderImpl.InvalidCharRecovery(Int32& bytesCount, Int32& charsCount)
at System.Xml.XmlTextReaderImpl.GetChars(Int32 maxCharsCount)
at System.Xml.XmlTextReaderImpl.ReadData()
at System.Xml.XmlTextReaderImpl.InitStreamInput(Uri baseUri, String baseUriStr, Stream stream, Byte[] bytes, Int32 byteCount, Encoding encoding)
at System.Xml.XmlTextReaderImpl.FinishInitStream()
at System.Xml.XmlTextReaderImpl..ctor(Stream stream, Byte[] bytes, Int32 byteCount, XmlReaderSettings settings, Uri baseUri, String baseUriStr, XmlParserContext context, Boolean closeInput)
at System.Xml.XmlReaderSettings.CreateReader(Stream input, Uri baseUri, String baseUriString, XmlParserContext inputContext)
at System.Xml.XmlReader.Create(Stream input)
The environment:
.NET Core SDK (reflecting any global.json):
Version: 2.2.103
Commit: 8edbc2570a
Runtime Environment:
OS Name: Mac OS X
OS Version: 10.14
OS Platform: Darwin
RID: osx.10.14-x64
Base Path: /usr/local/share/dotnet/sdk/2.2.103/
Found via SharpFuzz.
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