2 files changed, 89 insertions, 48 deletions

diff --git a/xorg-server/Xi/exevents.c b/xorg-server/Xi/exevents.c
index c22d934d7..823e539e8 100644
--- a/xorg-server/Xi/exevents.c
+++ b/xorg-server/Xi/exevents.c
@@ -1411,7 +1411,7 @@ DeliverTouchEmulatedEvent(DeviceIntPtr dev, TouchPointInfoPtr ti,
     ptrev->device_event.corestate = event_get_corestate(dev, kbd);
 
     if (grab) {
-        /* this side-steps the usual activation mechansims, but... */
+        /* this side-steps the usual activation mechanisms, but... */
         if (ev->any.type == ET_TouchBegin && !dev->deviceGrab.grab)
             ActivatePassiveGrab(dev, grab, ptrev, ev);  /* also delivers the event */
         else {
@@ -1568,32 +1568,41 @@ ProcessTouchEvent(InternalEvent *ev, DeviceIntPtr dev)
     else
         ti = TouchFindByClientID(dev, touchid);
 
-    /* Under the following circumstances we create a new touch record for an
-     * existing touch:
-     *
-     * - The touch may be pointer emulated
-     * - An explicit grab is active on the device
-     * - The grab is a pointer grab
-     *
-     * This allows for an explicit grab to receive pointer events for an already
-     * active touch.
-     */
-    if (!ti && type != ET_TouchBegin && emulate_pointer &&
-        dev->deviceGrab.grab && !dev->deviceGrab.fromPassiveGrab &&
+    /* Active pointer grab */
+    if (emulate_pointer && dev->deviceGrab.grab && !dev->deviceGrab.fromPassiveGrab &&
         (dev->deviceGrab.grab->grabtype == CORE ||
          dev->deviceGrab.grab->grabtype == XI ||
-         !xi2mask_isset(dev->deviceGrab.grab->xi2mask, dev, XI_TouchBegin))) {
-        ti = TouchBeginTouch(dev, ev->device_event.sourceid, touchid,
-                             emulate_pointer);
-        if (!ti) {
-            DebugF("[Xi] %s: Failed to create new dix record for explicitly "
-                   "grabbed touchpoint %d\n",
-                   dev->name, touchid);
-            return;
-        }
+         !xi2mask_isset(dev->deviceGrab.grab->xi2mask, dev, XI_TouchBegin)))
+    {
+        /* Active pointer grab on touch point and we get a TouchEnd - claim this
+         * touchpoint accepted, otherwise clients waiting for ownership will
+         * wait on this touchpoint until this client ungrabs, or the cows come
+         * home, whichever is earlier */
+        if (ti && type == ET_TouchEnd)
+            TouchListenerAcceptReject(dev, ti, 0, XIAcceptTouch);
+        else if (!ti && type != ET_TouchBegin) {
+            /* Under the following circumstances we create a new touch record for an
+             * existing touch:
+             *
+             * - The touch may be pointer emulated
+             * - An explicit grab is active on the device
+             * - The grab is a pointer grab
+             *
+             * This allows for an explicit grab to receive pointer events for an already
+             * active touch.
+             */
+            ti = TouchBeginTouch(dev, ev->device_event.sourceid, touchid,
+                                 emulate_pointer);
+            if (!ti) {
+                DebugF("[Xi] %s: Failed to create new dix record for explicitly "
+                       "grabbed touchpoint %d\n",
+                       dev->name, touchid);
+                return;
+            }
 
-        TouchBuildSprite(dev, ti, ev);
-        TouchSetupListeners(dev, ti, ev);
+            TouchBuildSprite(dev, ti, ev);
+            TouchSetupListeners(dev, ti, ev);
+        }
     }
 
     if (!ti) {
diff --git a/xorg-server/Xi/xiselectev.c b/xorg-server/Xi/xiselectev.c
index 3040aa911..8592747f6 100644
--- a/xorg-server/Xi/xiselectev.c
+++ b/xorg-server/Xi/xiselectev.c
@@ -37,6 +37,57 @@
 #include "xiselectev.h"
 
 /**
+ * Ruleset:
+ * - if A has XIAllDevices, B may select on device X
+ * - If A has XIAllDevices, B may select on XIAllMasterDevices
+ * - If A has XIAllMasterDevices, B may select on device X
+ * - If A has XIAllMasterDevices, B may select on XIAllDevices
+ * - if A has device X, B may select on XIAllDevices/XIAllMasterDevices
+ */
+static int check_for_touch_selection_conflicts(ClientPtr B, WindowPtr win, int deviceid)
+{
+    OtherInputMasks *inputMasks = wOtherInputMasks(win);
+    InputClients *A = NULL;
+
+    if (inputMasks)
+        A = inputMasks->inputClients;
+    for (; A; A = A->next) {
+        DeviceIntPtr tmp;
+
+        if (CLIENT_ID(A->resource) == B->index)
+            continue;
+
+        if (deviceid == XIAllDevices)
+            tmp = inputInfo.all_devices;
+        else if (deviceid == XIAllMasterDevices)
+            tmp = inputInfo.all_master_devices;
+        else
+            dixLookupDevice(&tmp, deviceid, serverClient, DixReadAccess);
+        if (!tmp)
+            return BadImplementation;       /* this shouldn't happen */
+
+        /* A has XIAllDevices */
+        if (xi2mask_isset_for_device(A->xi2mask, inputInfo.all_devices, XI_TouchBegin)) {
+            if (deviceid == XIAllDevices)
+                return BadAccess;
+        }
+
+        /* A has XIAllMasterDevices */
+        if (xi2mask_isset_for_device(A->xi2mask, inputInfo.all_master_devices, XI_TouchBegin)) {
+            if (deviceid == XIAllMasterDevices)
+                return BadAccess;
+        }
+
+        /* A has this device */
+        if (xi2mask_isset_for_device(A->xi2mask, tmp, XI_TouchBegin))
+            return BadAccess;
+    }
+
+    return Success;
+}
+
+
+/**
  * Check the given mask (in len bytes) for invalid mask bits.
  * Invalid mask bits are any bits above XI2LastEvent.
  *
@@ -169,30 +220,11 @@ ProcXISelectEvents(ClientPtr client)
              * same devices, including master devices.
              * XXX: This breaks if a device goes from floating to attached. */
             if (BitIsOn(bits, XI_TouchBegin)) {
-                OtherInputMasks *inputMasks = wOtherInputMasks(win);
-                InputClients *iclient = NULL;
-
-                if (inputMasks)
-                    iclient = inputMasks->inputClients;
-                for (; iclient; iclient = iclient->next) {
-                    DeviceIntPtr tmp;
-
-                    if (CLIENT_ID(iclient->resource) == client->index)
-                        continue;
-
-                    if (evmask->deviceid == XIAllDevices)
-                        tmp = inputInfo.all_devices;
-                    else if (evmask->deviceid == XIAllMasterDevices)
-                        tmp = inputInfo.all_master_devices;
-                    else
-                        dixLookupDevice(&tmp, evmask->deviceid, serverClient,
-                                        DixReadAccess);
-                    if (!tmp)
-                        return BadImplementation;       /* this shouldn't happen */
-
-                    if (xi2mask_isset(iclient->xi2mask, tmp, XI_TouchBegin))
-                        return BadAccess;
-                }
+                rc = check_for_touch_selection_conflicts(client,
+                                                         win,
+                                                         evmask->deviceid);
+                if (rc != Success)
+                    return rc;
             }
         }