[Bug 54610] New: fusion:asmcache - 32-bit calls to InstallAssembly(..., NULL) crash on Windows

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54610

Bug ID: 54610
           Summary: fusion:asmcache - 32-bit calls to InstallAssembly(...,
                    NULL) crash on Windows
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: fusion
          Assignee: [e-mail]
          Reporter: [e-mail]

fusion:asmcache - 32-bit calls to InstallAssembly(..., NULL) crash on Windows:

asmcache.c:846: this is the last test seen before the exception
19e4:asmcache: unhandled exception c0000005 at 0095C478

See https://test.winehq.org/data/patterns.html#fusion:asmcache

The crash only happens in the 32-bit w11pro64 tests which represents 100% of
the cases where the test actually runs:
* The only VM that has the needed fusion dll is w11pro64.
* The dll was installed by running the dotnetfx-1.1.exe installer [1] which is
only available in 32-bit format. Thus only the 32-bit dll is available and the
64-bit test is skipped.

The crash happens in the following call:
    hr = IAssemblyCache_InstallAssembly(cache, 0, L"wine.dll", NULL);

But skipping this call just moves the crash to the next InstallAssembly() call.
It's not clear whether the crash is caused by the NULL RefData pointer: the
crash still happens if I pass a non-NULL but pretty empty
FUSION_INSTALL_REFERENCE structure (in particular szNonCannonicalData == NULL).

[1] https://wiki.winehq.org/Wine_TestBot_VMs#fusion.2C_msvcr71