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xfree86: Check for existence of button class before dereferencing it.

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The Irxon Super Mini Bluetooth Wireless Keyboard for PC/PDA/Cell Phones
keyboards have axes but not buttons. The evdev driver doesn't set up a
button class for these keyboards and a motion event handled by
DGAProcessPointerEvent dereferences the dev->button NULL pointer, causing a
server crash.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Keith Packard <keithp@keithp.com>
(cherry picked from commit e00e2e7b68)
This commit is contained in:
Peter Hutterer 2010-08-23 08:35:01 +10:00
parent 5a29cb126d
commit 918cb214ab
1 changed files with 1 additions and 1 deletions
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2
hw/xfree86/common/xf86DGA.c
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@ -1095,7 +1095,7 @@ DGAProcessPointerEvent (ScreenPtr pScreen, DGAEvent *event, DeviceIntPtr mouse)
ev.header = ET_Internal;
ev.length = sizeof(ev);
ev.type = event->subtype;
ev.corestate = butc->state;
ev.corestate = butc ? butc->state : 0;
if (master && master->key)
ev.corestate |= XkbStateFieldFromRec(&master->key->xkbInfo->state);