[Bug 51139] Application T at X 2021 freezes when trying to transmit data to Elster (German Tax Application)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51139

--- Comment #16 from Dieter Jurzitza <dieter.jurzitza at harman.com> ---
I tried to guess from ms' patch what is the culprit and tried to change the
code a such for futher testing:

--- dlls/d2d1/geometry.c.original       2021-07-20 22:09:28.000000000 +0200
+++ dlls/d2d1/geometry.c        2021-07-30 21:51:31.768045816 +0200
@@ -1708,12 +1708,21 @@
 {
     D2D1_POINT_2F intersection;
     float t;
-
+    double delta=0;
+    
     d2d_point_calculate_bezier(&intersection, p[0], p[1], p[2], s);
-    if (fabsf(q[1]->x - q[0]->x) > fabsf(q[1]->y - q[0]->y))
-        t = (intersection.x - q[0]->x) / (q[1]->x - q[0]->x);
-    else
-        t = (intersection.y - q[0]->y) / (q[1]->y - q[0]->y);
+    if (fabsf(q[1]->x - q[0]->x) > fabsf(q[1]->y - q[0]->y)){
+        delta=(q[1]->x - q[0]->x);
+        if (delta < 1.0e-12)
+          delta=1.0e-12;
+        t = (intersection.x - q[0]->x) / delta;
+    }
+    else {
+        delta = (q[1]->y - q[0]->y);
+        if (delta < 1.0e-12)
+          delta=1.0e-12;
+        t = (intersection.y - q[0]->y) / delta;
+    }
     if (t < 0.0f || t > 1.0f)
         return TRUE;

thereby trying to avoid a divide - by - zero situation. However, this did not
change anything in regards to the system behavior and the bug apparently
remained "as is", wine crashing after messaging that a severe error had
occured.
I guess my assumption is wrong - would some kind soul direct me to the right
place that needs modification?
Thank you
take care

Dieter

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