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xfree86: Set pScrn->pScreen before driver ScreenInit is called 

Any code called from the driver ScreenInit may want to refer to
pScrn->pScreen. As the function passed to AddScreen is the first place
the DDX sees a new screen, the generic code needs to make sure that
value is set before passing control to the video driver's
initialization code.

This was found by running a driver which didn't bother to set this
value when the initial colormap was installed; xf86RandR12LoadPalette
tried to use pScrn->pScreen and crashed.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97124
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-and-Tested-by: Michel Dänzer <michel.daenzer@amd.com>
This commit is contained in:
Keith Packard 2016-07-29 17:45:45 -07:00
parent 387d6b5df3
commit 69b782aa75
1 changed files with 11 additions and 2 deletions
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13
hw/xfree86/common/xf86Init.c
View File

@ -360,6 +360,15 @@ AddVTAtoms(CallbackListPtr *pcbl, void *data, void *screen)
"Failed to register VT properties\n");
}
static Bool
xf86ScreenInit(ScreenPtr pScreen, int argc, char **argv)
{
ScrnInfoPtr pScrn = xf86ScreenToScrn(pScreen);
pScrn->pScreen = pScreen;
return pScrn->ScreenInit (pScreen, argc, argv);
}
/*
* InitOutput --
* Initialize screenInfo for all actually accessible framebuffers.
@ -791,7 +800,7 @@ InitOutput(ScreenInfo * pScreenInfo, int argc, char **argv)
pScrn->SetOverscan = NULL;
pScrn->DriverFunc = NULL;
pScrn->pScreen = NULL;
scr_index = AddGPUScreen(pScrn->ScreenInit, argc, argv);
scr_index = AddGPUScreen(xf86ScreenInit, argc, argv);
xf86VGAarbiterUnlock(pScrn);
if (scr_index == i) {
dixSetPrivate(&screenInfo.gpuscreens[scr_index]->devPrivates,
@ -819,7 +828,7 @@ InitOutput(ScreenInfo * pScreenInfo, int argc, char **argv)
xf86Screens[i]->SetOverscan = NULL;
xf86Screens[i]->DriverFunc = NULL;
xf86Screens[i]->pScreen = NULL;
scr_index = AddScreen(xf86Screens[i]->ScreenInit, argc, argv);
scr_index = AddScreen(xf86ScreenInit, argc, argv);
xf86VGAarbiterUnlock(xf86Screens[i]);
if (scr_index == i) {
/*