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dix: fix crash on shutdown if a disabled device is still grabbed (XI1 grab) 

A disabled device doesn't have a sprite (less so a sprite->win) and triggers
a NULL-pointer dereference on shutdown when all active grabs are released as
part of the cleanup.

Fix this by checking for sprite being non-null and setting the focus window
to the NullWindow if it is. The rest of the patch just attempts to make
things more readable.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Peter Hutterer 2012-10-10 13:33:48 +10:00
parent 0c7109f321
commit 4b7f00346d
1 changed files with 12 additions and 4 deletions
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16
dix/events.c
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@ -1593,13 +1593,10 @@ DeactivateKeyboardGrab(DeviceIntPtr keybd)
{
GrabPtr grab = keybd->deviceGrab.grab;
DeviceIntPtr dev;
WindowPtr focusWin = keybd->focus ? keybd->focus->win
: keybd->spriteInfo->sprite->win;
WindowPtr focusWin;
Bool wasImplicit = (keybd->deviceGrab.fromPassiveGrab &&
keybd->deviceGrab.implicitGrab);
if (focusWin == FollowKeyboardWin)
focusWin = inputInfo.keyboard->focus->win;
if (keybd->valuator)
keybd->valuator->motionHintWindow = NullWindow;
keybd->deviceGrab.grab = NullGrab;
@ -1610,6 +1607,17 @@ DeactivateKeyboardGrab(DeviceIntPtr keybd)
if (dev->deviceGrab.sync.other == grab)
dev->deviceGrab.sync.other = NullGrab;
}
if (keybd->focus)
focusWin = keybd->focus->win;
else if (keybd->spriteInfo->sprite)
focusWin = keybd->spriteInfo->sprite->win;
else
focusWin = NullWindow;
if (focusWin == FollowKeyboardWin)
focusWin = inputInfo.keyboard->focus->win;
DoFocusEvents(keybd, grab->window, focusWin, NotifyUngrab);
if (!wasImplicit && grab->grabtype == XI2)