[Bug 41738] New: Cloning and releasing an IStream frees the HGLOBAL memory

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=41738

            Bug ID: 41738
           Summary: Cloning and releasing an IStream frees the HGLOBAL
                    memory
           Product: Wine
           Version: 1.9.23
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ole32
          Assignee: wine-bugs at winehq.org
          Reporter: pgkos.bugzilla at yahoo.com
      Distribution: ArchLinux

I have been experiencing crashes (using Wine 1.9.23, 32-bit, on 32-bit Arch
Linux with Linux kernel 4.8.8) in some of my apps. I have pinpointed the cause.

The issue can be reproduced this way:

1. Create a stream using CreateStreamOnHGlobal().
2. Make a clone of it using IStream::Clone() (HGLOBALStreamImpl_Clone).
3. Release the original stream.
4. Unfortunately, the global memory (HGLOBAL) is freed when just one stream is
released.
5. Trying to read the cloned stream via HGLOBALStreamImpl_Read fails, because
the memory has been already freed.

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