[Mono-bugs] [Bug 676060] New: System.IO.MemoryStream can throw NullReferenceExceptions when expanding internal buffer

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https://bugzilla.novell.com/show_bug.cgi?id=676060

https://bugzilla.novell.com/show_bug.cgi?id=676060#c0


           Summary: System.IO.MemoryStream can throw
                    NullReferenceExceptions when expanding internal buffer
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.8.x
          Platform: x86-64
        OS/Version: Ubuntu
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Sys.Core
        AssignedTo: jbevain at novell.com
        ReportedBy: lvanspronsen at escautomation.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US)
AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.107 Safari/534.13

There is an issue with the setter for System.IO.MemoryStream.Capacity.

In all constructors, MemoryStream initiates internalBuffer to some byte array,
and the rest of the class is programmed with that assumption in mind.

However, explicitly setting MemoryStream.Capacity = 0 will cause internalBuffer
to be set to null. (see MemoryStream.cs lines 168 - 172 )

At this point, any calls to Expand or attempts to set Capacity will throw
NullReferenceExceptions at line 165 of MemoryStream.cs

Reproducible: Always

Steps to Reproduce:
1. Create a new MemoryStream instance using any constructor
2. Write something to the memory stream
3. Explicitly set the instance's Position to 0
4. Explicitly set the instance's length to 0using SetLength()
5. Explicitly set the instance's Capacity property to 0
6. Try write something to the MemoryStream
Actual Results:  
Throws a NullReferenceException at line 165 of MemoryStream.cs

Expected Results:  
MemoryStream expands internal buffer properly and continues serializing values
to internal buffer without throwing an exception

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