crash in GetKerningPairs

[Piotr Pawłow]

Hello,

Wine's implementation of GetKerningPairs in dlls/gdi/font.c behaves 
incorrectly (crashes) if lpkrnpair is NULL and nNumPairs is not zero.

Test program:

----------

#include <windows.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR 
lpCmdLine, int nCmdShow)
{
    HDC hdc = GetDC(NULL);
    int kp = GetKerningPairs(hdc, 1, NULL);
    char msg[200];
    sprintf(msg, "GetKerningPairs returns: %d\n", kp);
    MessageBox(NULL, msg, "success", MB_OK);
    return 0;
}

----------

On Windows (tested on XP SP2) this program displays a message box and exits 
cleanly. On Wine it causes a page fault trying to write to address 
0x00000004.

It's probably a trivial problem, but unfortunately I don't have time right now 
to investigate the issue and make a patch against current CVS.

Best regards,
-- 
 Piotr Pawłow
 mailto:pp at siedziba.pl