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xwayland: Clear private on device removal

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Xwayland uses the device private to point to the `xwl_seat`.

Device may be removed at any time, including on suspend.

On resume, if the DIX code ends up calling a function that requires the
`xwl_seat` such as `xwl_set_cursor()` we may end up pointing at random
data.

Make sure the clear the device private data on removal so that we don't
try to use it and crash later.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
https://gitlab.freedesktop.org/xorg/xserver/issues/709
This commit is contained in:
Olivier Fourdan 2020-05-05 15:40:43 +02:00 committed by Olivier Fourdan
parent 6ef1b0108e
commit 4195e80356
1 changed files with 39 additions and 16 deletions
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55
hw/xwayland/xwayland-input.c
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@ -854,6 +854,9 @@ remove_sync_pending(DeviceIntPtr dev)
struct xwl_seat *xwl_seat = dev->public.devicePrivate;
struct sync_pending *p, *npd;
if (!xwl_seat)
return;
xorg_list_for_each_entry_safe(p, npd, &xwl_seat->sync_pending, l) {
if (p->pending_dev == dev) {
xorg_list_del(&xwl_seat->sync_pending);
@ -880,11 +883,15 @@ static Bool
keyboard_check_repeat (DeviceIntPtr dev, XkbSrvInfoPtr xkbi, unsigned key)
{
struct xwl_seat *xwl_seat = dev->public.devicePrivate;
struct xwl_screen *xwl_screen = xwl_seat->xwl_screen;
struct xwl_screen *xwl_screen;
struct wl_callback *callback;
struct sync_pending *p;
if (!xwl_seat)
return FALSE;
/* Make sure we didn't miss a possible reply from the compositor */
xwl_screen = xwl_seat->xwl_screen;
xwl_sync_events (xwl_screen);
xorg_list_for_each_entry(p, &xwl_seat->sync_pending, l) {
@ -1172,6 +1179,21 @@ add_device(struct xwl_seat *xwl_seat,
return dev;
}
static void
disable_device(DeviceIntPtr dev)
{
DisableDevice(dev, TRUE);
dev->public.devicePrivate = NULL;
}
static void
enable_device(struct xwl_seat *xwl_seat, DeviceIntPtr dev)
{
dev->public.devicePrivate = xwl_seat;
EnableDevice(dev, TRUE);
}
static void
init_pointer(struct xwl_seat *xwl_seat)
{
@ -1185,7 +1207,7 @@ init_pointer(struct xwl_seat *xwl_seat)
add_device(xwl_seat, "xwayland-pointer", xwl_pointer_proc);
ActivateDevice(xwl_seat->pointer, TRUE);
}
EnableDevice(xwl_seat->pointer, TRUE);
enable_device(xwl_seat, xwl_seat->pointer);
}
static void
@ -1195,7 +1217,7 @@ release_pointer(struct xwl_seat *xwl_seat)
xwl_seat->wl_pointer = NULL;
if (xwl_seat->pointer)
DisableDevice(xwl_seat->pointer, TRUE);
disable_device(xwl_seat->pointer);
}
static void
@ -1219,7 +1241,7 @@ init_relative_pointer(struct xwl_seat *xwl_seat)
xwl_pointer_proc_relative);
ActivateDevice(xwl_seat->relative_pointer, TRUE);
}
EnableDevice(xwl_seat->relative_pointer, TRUE);
enable_device(xwl_seat, xwl_seat->relative_pointer);
}
static void
@ -1231,7 +1253,7 @@ release_relative_pointer(struct xwl_seat *xwl_seat)
}
if (xwl_seat->relative_pointer)
DisableDevice(xwl_seat->relative_pointer, TRUE);
disable_device(xwl_seat->relative_pointer);
}
static void
@ -1248,7 +1270,7 @@ init_keyboard(struct xwl_seat *xwl_seat)
add_device(xwl_seat, "xwayland-keyboard", xwl_keyboard_proc);
ActivateDevice(xwl_seat->keyboard, TRUE);
}
EnableDevice(xwl_seat->keyboard, TRUE);
enable_device(xwl_seat, xwl_seat->keyboard);
xwl_seat->keyboard->key->xkbInfo->checkRepeat = keyboard_check_repeat;
if (xwl_seat->xwl_screen->wp_grab) {
@ -1268,7 +1290,7 @@ release_keyboard(struct xwl_seat *xwl_seat)
if (xwl_seat->keyboard) {
remove_sync_pending(xwl_seat->keyboard);
DisableDevice(xwl_seat->keyboard, TRUE);
disable_device(xwl_seat->keyboard);
}
}
@ -1284,8 +1306,7 @@ init_touch(struct xwl_seat *xwl_seat)
add_device(xwl_seat, "xwayland-touch", xwl_touch_proc);
ActivateDevice(xwl_seat->touch, TRUE);
}
EnableDevice(xwl_seat->touch, TRUE);
enable_device(xwl_seat, xwl_seat->touch);
}
static void
@ -1295,7 +1316,7 @@ release_touch(struct xwl_seat *xwl_seat)
xwl_seat->wl_touch = NULL;
if (xwl_seat->touch)
DisableDevice(xwl_seat->touch, TRUE);
disable_device(xwl_seat->touch);
}
static void
@ -1454,19 +1475,19 @@ tablet_handle_done(void *data, struct zwp_tablet_v2 *tablet)
xwl_seat->stylus = add_device(xwl_seat, "xwayland-tablet stylus", xwl_tablet_proc);
ActivateDevice(xwl_seat->stylus, TRUE);
}
EnableDevice(xwl_seat->stylus, TRUE);
enable_device(xwl_seat, xwl_seat->stylus);
if (xwl_seat->eraser == NULL) {
xwl_seat->eraser = add_device(xwl_seat, "xwayland-tablet eraser", xwl_tablet_proc);
ActivateDevice(xwl_seat->eraser, TRUE);
}
EnableDevice(xwl_seat->eraser, TRUE);
enable_device(xwl_seat, xwl_seat->eraser);
if (xwl_seat->puck == NULL) {
xwl_seat->puck = add_device(xwl_seat, "xwayland-tablet cursor", xwl_tablet_proc);
ActivateDevice(xwl_seat->puck, TRUE);
}
EnableDevice(xwl_seat->puck, TRUE);
enable_device(xwl_seat, xwl_seat->puck);
}
static void
@ -1481,11 +1502,11 @@ tablet_handle_removed(void *data, struct zwp_tablet_v2 *tablet)
will re-use the same X devices */
if (xorg_list_is_empty(&xwl_seat->tablets)) {
if (xwl_seat->stylus)
DisableDevice(xwl_seat->stylus, TRUE);
disable_device(xwl_seat->stylus);
if (xwl_seat->eraser)
DisableDevice(xwl_seat->eraser, TRUE);
disable_device(xwl_seat->eraser);
if (xwl_seat->puck)
DisableDevice(xwl_seat->puck, TRUE);
disable_device(xwl_seat->puck);
/* pads are removed separately */
}
@ -2541,6 +2562,8 @@ sprite_check_lost_focus(SpritePtr sprite, WindowPtr window)
return FALSE;
xwl_seat = device->public.devicePrivate;
if (!xwl_seat)
return FALSE;
master = GetMaster(device, POINTER_OR_FLOAT);
if (!master || !master->lastSlave)