[Bug 38675] New: valgrind shows uninitialized memory in kernel32/file.c:DeviceIoControl()

https://bugs.winehq.org/show_bug.cgi?id=38675

            Bug ID: 38675
           Summary: valgrind shows uninitialized memory in
                    kernel32/file.c:DeviceIoControl()
           Product: Wine
           Version: 1.7.44
          Hardware: x86
                OS: Linux
            Status: NEW
          Keywords: download, source, testcase, valgrind
          Severity: normal
          Priority: P2
         Component: kernel32
          Assignee: wine-bugs(a)winehq.org
          Reporter: austinenglish(a)gmail.com
      Distribution: Fedora

../../../tools/runtest -q -P wine -T ../../.. -M kernel32.dll -p
kernel32_test.exe.so drive && touch drive.ok
==14492== Syscall param writev(vector[...]) points to uninitialised byte(s)
==14492==    at 0x4F7A0F23: __writev_nocancel (in /usr/lib/libc-2.21.so)
==14492==    by 0x7BC7A9C5: send_request (server.c:228)
==14492==    by 0x7BC7AB52: wine_server_call (server.c:309)
==14492==    by 0x7BC7B8CD: server_select (server.c:607)
==14492==    by 0x7BC85426: NtWaitForMultipleObjects (sync.c:976)
==14492==    by 0x7BC85471: NtWaitForSingleObject (sync.c:985)
==14492==    by 0x7BC45DFF: server_ioctl_file (file.c:1539)
==14492==    by 0x7BC45FF7: NtDeviceIoControlFile (file.c:1628)
==14492==    by 0x7B840C64: DeviceIoControl (file.c:2599)
==14492==    by 0x7B87DAFA: get_mountmgr_drive_type (volume.c:206)
==14492==    by 0x7B88133A: GetDriveTypeW (volume.c:1614)
==14492==    by 0x7B8814F9: GetDriveTypeA (volume.c:1660)
==14492==    by 0x47D4D2E: test_GetDriveTypeA (drive.c:41)
==14492==    by 0x47D5770: func_drive (drive.c:207)
==14492==    by 0x4893BD4: run_test (test.h:584)
==14492==    by 0x489401C: main (test.h:666)
==14492==  Address 0x4b7f5c4 is on thread 1's stack
==14492==  in frame #3, created by server_select (server.c:586)
==14492==  Uninitialised value was created by a stack allocation
==14492==    at 0x7B840A55: DeviceIoControl (file.c:2549)
==14492==

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[Bug 38675] valgrind shows uninitialized memory in kernel32/file.c:DeviceIoControl()

https://bugs.winehq.org/show_bug.cgi?id=38675

--- Comment #1 from Austin English <austinenglish(a)gmail.com> ---
Also appears in mpr/tests/mpr.c.

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