After this patch got applied, the code looks like this:

(http://source.winehq.org/git/wine.git/blob/cc086f09ae46c77e6eb4a817ae567294d3f795ec:/dlls/comctl32/tab.c#l1914)

1914 if (!GetObjectW((infoPtr->hFont) ?
1915 infoPtr->hFont : GetStockObject(DEFAULT_GUI_FONT),
1916 sizeof(LOGFONTW),&logfont))
1917 GetStockObject(DEFAULT_GUI_FONT);

I'm quite sure you didn't mean to ignore return value of GetStockObject and leave logfont uninitialized here.

Regards,

Daniel

(sorry for being late to the party, I'm not subscribing wine-patches, and kind of assumed this patch wouldn't get past AJ)