weston: xwayland: Fix crash when run with no input device

Starting an xterm with no input device led to a crash
because weston_wm_pick_seat() was returning garbage and
weston_wm_selection_init() was trying to use the garbage.

Upstream-Status: Accepted [https://cgit.freedesktop.org/wayland/weston/commit/?id=e7fff215ada3fd3d1b2af664888f960c082f9065]

Signed-off-by: Tom Hochstein <tom.hochstein@nxp.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

2 files changed, 49 insertions, 0 deletions

diff --git a/recipes-graphics/wayland/weston/0019-xwayland-Fix-crash-when-run-with-no-input-device.patch b/recipes-graphics/wayland/weston/0019-xwayland-Fix-crash-when-run-with-no-input-device.patch
new file mode 100644
index 00000000..1304cef2
--- /dev/null
+++ b/recipes-graphics/wayland/weston/0019-xwayland-Fix-crash-when-run-with-no-input-device.patch
@@ -0,0 +1,45 @@
+From 60f8817f371123b9c36b3ff1120eec1e8f9e3d10 Mon Sep 17 00:00:00 2001
+From: Tom Hochstein <tom.hochstein@nxp.com>
+Date: Mon, 31 Oct 2016 19:21:58 -0500
+Subject: [PATCH weston] xwayland: Fix crash when run with no input device
+
+Starting an xterm with no input device led to a crash
+because weston_wm_pick_seat() was returning garbage and
+weston_wm_selection_init() was trying to use the garbage.
+
+Signed-off-by: Tom Hochstein <tom.hochstein@nxp.com>
+---
+ xwayland/selection.c      | 10 +++++++---
+ xwayland/window-manager.c |  6 ++++--
+ 2 files changed, 11 insertions(+), 5 deletions(-)
+
+Index: weston-1.11.0/xwayland/selection.c
+===================================================================
+--- weston-1.11.0.orig/xwayland/selection.c     2016-05-19 16:36:04.000000000 -0500
++++ weston-1.11.0/xwayland/selection.c  2016-11-01 14:32:48.000000000 -0500
+@@ -708,6 +708,8 @@
+                                          wm->atom.clipboard, mask);
+ 
+        seat = weston_wm_pick_seat(wm);
++       if (seat != NULL)
++               return;
+        wm->selection_listener.notify = weston_wm_set_selection;
+        wl_signal_add(&seat->selection_signal, &wm->selection_listener);
+ 
+Index: weston-1.11.0/xwayland/window-manager.c
+===================================================================
+--- weston-1.11.0.orig/xwayland/window-manager.c        2016-05-19 16:36:04.000000000 -0500
++++ weston-1.11.0/xwayland/window-manager.c     2016-11-01 11:47:14.549606964 -0500
+@@ -1303,8 +1303,10 @@
+ struct weston_seat *
+ weston_wm_pick_seat(struct weston_wm *wm)
+ {
+-       return container_of(wm->server->compositor->seat_list.next,
+-                           struct weston_seat, link);
++       struct wl_list *seats = wm->server->compositor->seat_list.next;
++       if (wl_list_empty(seats))
++               return NULL;
++       return container_of(seats, struct weston_seat, link);
+ }
+ 
+ static struct weston_seat *
diff --git a/recipes-graphics/wayland/weston_%.bbappend b/recipes-graphics/wayland/weston_%.bbappend
index 8a47ba52..dfd7da44 100644
--- a/recipes-graphics/wayland/weston_%.bbappend
+++ b/recipes-graphics/wayland/weston_%.bbappend
@@ -19,6 +19,10 @@ SRC_URI_append_imxgpu3d = " \
     file://0018-MGS-2397-ccc-Enable-double-buffer-with-fb_pan_displa.patch \
 "
 
+SRC_URI_append = " \
+    file://0019-xwayland-Fix-crash-when-run-with-no-input-device.patch     \
+"
+
 # The 'egl' configuration of weston requires gles support, and consideration
 # must be taken for the different SoC capabilities:
 # - For SoCs with 3d support, imx-gpu-viv provides hardware-accelerated