Segmentation fault when using xrandr and vesa

[Arne Georg Gleditsch]

Hi,

When changing screen resolution with xrandr on a server using the vesa 
video driver, we have been experiencing segmentation faults.  It turns 
out that xf86EnableDisableFBAccess is called twice to disable the 
display (and twice to enable it).  This clobbers 
pScrnInfo->pixmapPrivate, which is supposed to keep the backup copy of 
pspix->devPrivate.  The end result is that pspix->devPrivate is null 
when the operation is completed, causing fbBlt to segfault. (This is 
without USE_MMX, which might be of consequence.)  I don't know if 
calling xf86EnableDisableFBAccess more than once is supposed to be 
allowed, but at least the appended patch renders it harmless.

-- 

							Arne.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: vesa_fb_xrandr.patch
Type: text/x-patch
Size: 441 bytes
Desc: not available
Url : http://lists.x.org/archives/xorg-modular/attachments/20060906/d59860a6/vesa_fb_xrandr.bin