The code does

AvailFBArea.y2 = (pVia->FBFreeEnd) / pVia->Bpl;

but pVia->Bpl can be zero - it's set only in via_accel.c.

Here's the section that provoked the bug:

Section "Device"
   Identifier  "CLE266 chip"
   Driver      "via"
   Option      "useBIOS" "true"
   Option     "ShadowFB" "true"
   Option     "NoAccel"
   Option      "SWCursor" "true"
   Option     "HWCursor" "false"
   Option     "DisableVQ" "true"
   Option     "NoDDCValue" "true"
   Option      "ActiveDevice" "CRT"
EndSection

Basically, by disabling everything, hoping to avoid one bug, I provoked another ;)

--Arnt
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