mi: don't process events from disabled devices (#77884)

Once a device is disabled, it doesn't have a sprite pointer anymore. If an
event is still in the queue and processed after DisableDevice finished, a
dereference causes a crash. Example backtrace (crash forced by injecting an
event at the right time):

(EE) 0: /opt/xorg/bin/Xorg (OsSigHandler+0x3c) [0x48d334]
(EE) 1: /lib64/libpthread.so.0 (__restore_rt+0x0) [0x37fcc0f74f]
(EE) 2: /opt/xorg/bin/Xorg (mieqMoveToNewScreen+0x38) [0x609240]
(EE) 3: /opt/xorg/bin/Xorg (mieqProcessDeviceEvent+0xd4) [0x609389]
(EE) 4: /opt/xorg/bin/Xorg (mieqProcessInputEvents+0x206) [0x609720]
(EE) 5: /opt/xorg/bin/Xorg (ProcessInputEvents+0xd) [0x4aeb58]
(EE) 6: /opt/xorg/bin/Xorg (xf86VTSwitch+0x1a6) [0x4af457]
(EE) 7: /opt/xorg/bin/Xorg (xf86Wakeup+0x2bf) [0x4af0a7]
(EE) 8: /opt/xorg/bin/Xorg (WakeupHandler+0x83) [0x4445cb]
(EE) 9: /opt/xorg/bin/Xorg (WaitForSomething+0x3fe) [0x491bf6]
(EE) 10: /opt/xorg/bin/Xorg (Dispatch+0x97) [0x435748]
(EE) 11: /opt/xorg/bin/Xorg (dix_main+0x61d) [0x4438a9]
(EE) 12: /opt/xorg/bin/Xorg (main+0x28) [0x49ba28]
(EE) 13: /lib64/libc.so.6 (__libc_start_main+0xf5) [0x37fc821d65]
(EE) 14: /opt/xorg/bin/Xorg (_start+0x29) [0x425e69]
(EE) 15: ? (?+0x29) [0x29]

xf86VTSwitch() calls ProcessInputEvents() before disabling a device, and
DisableDevice() calls mieqProcessInputEvents() again when flushing touches and
button events. Between that and disabling the device (which causes new events
to be refused) there is a window where events may be triggered and enqueued.
On the next call to PIE that event is processed on a now defunct device,
causing the crash.

The simplest fix to this is to discard events from disabled devices. We flush
the queue often enough before disabling that when we get here, we really don't
care about the events from this device.

X.Org Bug 77884 <http://bugs.freedesktop.org/show_bug.cgi?id=77884>

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reported-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Tested-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/mi/mieq.c b/mi/mieq.c
index 36aa21357..0e27405cc 100644
--- a/mi/mieq.c
+++ b/mi/mieq.c
@@ -515,6 +515,10 @@ mieqProcessDeviceEvent(DeviceIntPtr dev, InternalEvent *event, ScreenPtr screen)
 
     verify_internal_event(event);
 
+    /* refuse events from disabled devices */
+    if (!dev->enabled)
+        return 0;
+
     /* Custom event handler */
     handler = miEventQueue.handlers[event->any.type];