New subject: [Bug 54415] mshtml:misc may crash because of an ole32 MapViewOfFile() failure in Wine

31 Jan 2023


      https://bugs.winehq.org/show_bug.cgi?id=54415
Bug ID: 54415
           Summary: mshtml:misc may crash because of an ole32
                    MapViewOfFile() failure in Wine
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ole32
          Assignee: wine-bugs@winehq.org
          Reporter: fgouget@codeweavers.com
      Distribution: ---
In MR2024 mshtml:misc crashed:
mshtml:misc start dlls/mshtml/tests/misc.c
Unhandled exception: page fault on write access to 0x00000000 in 32-bit code
(0x6ab29755).
...
Backtrace:
=>0 0x6ab29755 in ucrtbase (+0x69755) (0x0075f758)
  1 0x6ab310de memcpy+0x4e(dst=0x000000000, src=0B7F6EF8, n=0x44)
[Z:\home\winetest\tools\testbot\var\wine\dlls\msvcrt\string.c:3063] in ucrtbase
(0x0075f758)
  2 0x008ce97c create_map_from_stream+0xbc(map=<internal error>,
stream=<internal error>)
[Z:\home\winetest\tools\testbot\var\wine\dlls\ole32\ole2.c:335] in ole32
(0x0075f7b8)
  3 0x008ce97c RegisterDragDrop+0x23c(hwnd=<couldn't compute location>,
pDropTarget=<couldn't compute location>)
[Z:\home\winetest\tools\testbot\var\wine\dlls\ole32\ole2.c:615] in ole32
(0x0075f7b8)
  4 0x11a9a2d7 in xul (+0x1a9a2d7) (0x0075f7ec)
...
mshtml:misc:093c done (-1073741819) in 0s 10696B
This does not seem to have ever happened in the WineTest runs so that the above
merge request is the only known instance.
Looking at create_map_from_stream() it looks like:
* CreateFileMappingW() succeeded
* MapViewOfFile() failed, returning NULL...
* ...which caused memcpy(NULL, ...) to crash
Unfortunately there is no trace that would explain why MapViewOfFile() failed.
I'm also unsure of the connection between mshtml:misc and RegisterDragDrop().
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[Bug 54415] New: mshtml:misc may crash because of an ole32 MapViewOfFile() failure in Wine