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dix: avoid NULL-pointer dereference on button-only devices (#38313) 

And for such devices simply take the last.valuators[] which must be valid at
all times anyway. UpdateSlaveDeviceCoords takes care of that.

X.Org Bug 38313 <http://bugs.freedesktop.org/show_bug.cgi?id=38313>

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Chase Douglas <chase.douglas@canonical.com>
This commit is contained in:
Peter Hutterer 2012-02-22 15:32:56 +10:00
parent 38000e7d1f
commit 2416ee4a01
1 changed files with 15 additions and 4 deletions
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19
dix/getevents.c
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@ -840,10 +840,15 @@ scale_to_desktop(DeviceIntPtr dev, ValuatorMask *mask,
ScreenPtr scr = miPointerGetScreen(dev);
double x, y;
BUG_WARN(!dev->valuator);
BUG_WARN(dev->valuator->numAxes < 2);
BUG_WARN(!dev->valuator || dev->valuator->numAxes < 2);
if (!dev->valuator || dev->valuator->numAxes < 2)
{
/* if we have no axes, last.valuators must be in screen coords
* anyway */
*devx = *screenx = dev->last.valuators[0];
*devy = *screeny = dev->last.valuators[1];
return scr;
}
if (valuator_mask_isset(mask, 0))
x = valuator_mask_get_double(mask, 0);
@ -1493,8 +1498,6 @@ GetPointerEvents(InternalEvent *events, DeviceIntPtr pDev, int type,
{
CARD32 ms = GetTimeInMillis();
int num_events = 0, nev_tmp;
int h_scroll_axis = pDev->valuator->h_scroll_axis;
int v_scroll_axis = pDev->valuator->v_scroll_axis;
ValuatorMask mask;
ValuatorMask scroll;
int i;
@ -1519,6 +1522,14 @@ GetPointerEvents(InternalEvent *events, DeviceIntPtr pDev, int type,
{
double val, adj;
int axis;
int h_scroll_axis = -1;
int v_scroll_axis = -1;
if (pDev->valuator)
{
h_scroll_axis = pDev->valuator->h_scroll_axis;
v_scroll_axis = pDev->valuator->v_scroll_axis;
}
/* Up is negative on valuators, down positive */
switch (buttons) {