A problem with comctl32
rolf.kalbermatter at citeng.com
Mon Nov 4 04:49:17 CST 2002
DanteAliegri <dantealiegri at umbc.edu> wrote:
>Hey, I've come across what appears to be a
>simple problem in comctl32.
>When running icq99b, wine was dying in imagelist.c while trying to
>dereference a null pointer.
>Upon looking at the file, there was code for returning FALSE if that
>pointer was null, thus I felt it being null may be a valid choice.
>I made the attached change, and the problem was fixed.
>--- imagelist.c 23 Oct 2002 22:19:11 -0000 1.65
>+++ imagelist.c 2 Nov 2002 20:40:53 -0000
>@@ -1082,11 +1082,14 @@
> HBITMAP hImageBmp, hOldImageBmp, hOldImageListBmp, hOldMaskListBmp,
> BOOL bIsTransparent, bBlend, bResult = FALSE;
> const HIMAGELIST himl = pimldp->himl;
According to the same lines pimldp could also be NULL so this might as
well cause a NULL pointer dereference and should be moved to after the
check for "if (!pimldp || !(himl = pimldp->himl)) return FALSE;
Of course the question remains why would you call the function at all
with a NULL pointer.
>- const INT lx = himl->cx * pimldp->i + pimldp->xBitmap;
>- const INT ly = pimldp->yBitmap;
>+ static INT lx;
>+ static INT ly;
Should this be really static? Can't this function be called reentrant?
> if (!pimldp || !himl) return FALSE;
> if ((pimldp->i < 0) || (pimldp->i >= himl->cCurImage)) return FALSE;
>+ lx = himl->cx * pimldp->i + pimldp->xBitmap;
>+ ly = pimldp->yBitmap;
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