Eryk Sun <[email protected]> added the comment:
It should be fine. If the docs don't require initializing cb, we can assume
it's done for us.
For example, msvcrt.dll calls GetStartupInfo without initializing this field:
0:000> kc 3
Call Site
KERNELBASE!GetStartupInfoW
msvcrt!ioinit
msvcrt!__CRTDLL_INIT
In x64, the first argument (lpStartupInfo) is in rcx. We see the DWORD (dd)
value of cb is initially 0:
0:000> dd @rcx l1
00000094`25ddefd0 00000000
Continue to the ret[urn] instruction via pt and check that the returned value
of cb is sizeof(*lpStartupInfo):
0:000> pt
KERNELBASE!GetStartupInfoW+0xb2:
00007fff`8ae41282 c3 ret
0:000> dd 94`25ddefd0 l1
00000094`25ddefd0 00000068
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