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From 23c81629d775fd902e4bee7ec0a182a916f4252b Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
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Date: Mon, 16 Sep 2019 16:17:48 +0200
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Subject: [PATCH 1/3] idle-monitor: Make helper function static
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It wasn't used outside the file, so no reason to not have it static.
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https://gitlab.gnome.org/GNOME/mutter/merge_requests/799
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---
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 src/backends/meta-idle-monitor-private.h | 1 -
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 src/backends/meta-idle-monitor.c         | 8 ++++----
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 2 files changed, 4 insertions(+), 5 deletions(-)
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diff --git a/src/backends/meta-idle-monitor-private.h b/src/backends/meta-idle-monitor-private.h
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index 82f3f87b7..9ce7e743a 100644
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--- a/src/backends/meta-idle-monitor-private.h
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+++ b/src/backends/meta-idle-monitor-private.h
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@@ -54,7 +54,6 @@ struct _MetaIdleMonitorClass
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   GObjectClass parent_class;
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 };
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-void _meta_idle_monitor_watch_fire (MetaIdleMonitorWatch *watch);
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 void meta_idle_monitor_reset_idletime (MetaIdleMonitor *monitor);
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 #endif /* META_IDLE_MONITOR_PRIVATE_H */
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diff --git a/src/backends/meta-idle-monitor.c b/src/backends/meta-idle-monitor.c
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index 2c06ee73c..ce1b87bbb 100644
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--- a/src/backends/meta-idle-monitor.c
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+++ b/src/backends/meta-idle-monitor.c
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@@ -54,8 +54,8 @@ static GParamSpec *obj_props[PROP_LAST];
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 G_DEFINE_TYPE (MetaIdleMonitor, meta_idle_monitor, G_TYPE_OBJECT)
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-void
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-_meta_idle_monitor_watch_fire (MetaIdleMonitorWatch *watch)
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+static void
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+meta_idle_monitor_watch_fire (MetaIdleMonitorWatch *watch)
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 {
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   MetaIdleMonitor *monitor;
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   guint id;
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@@ -319,7 +319,7 @@ idle_monitor_dispatch_timeout (GSource     *source,
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   if (ready_time > now)
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     return G_SOURCE_CONTINUE;
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-  _meta_idle_monitor_watch_fire (watch);
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+  meta_idle_monitor_watch_fire (watch);
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   g_source_set_ready_time (watch->timeout_source, -1);
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   return G_SOURCE_CONTINUE;
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@@ -506,7 +506,7 @@ meta_idle_monitor_reset_idletime (MetaIdleMonitor *monitor)
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       if (watch->timeout_msec == 0)
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         {
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-          _meta_idle_monitor_watch_fire ((MetaIdleMonitorWatch *) watch);
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+          meta_idle_monitor_watch_fire ((MetaIdleMonitorWatch *) watch);
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         }
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       else
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         {
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-- 
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2.23.0
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From 0d43bbdae0a08c7618e789fa0d5270615c907a36 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
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Date: Mon, 16 Sep 2019 16:36:05 +0200
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Subject: [PATCH 2/3] idle-monitor: Remove redundant type cast
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No need to type cast a `MetaIdleMonitorWatch *` to a
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`MetaIdleMonitorWatch *`.
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https://gitlab.gnome.org/GNOME/mutter/merge_requests/799
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---
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 src/backends/meta-idle-monitor.c | 2 +-
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 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/backends/meta-idle-monitor.c b/src/backends/meta-idle-monitor.c
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index ce1b87bbb..3dbb89944 100644
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--- a/src/backends/meta-idle-monitor.c
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+++ b/src/backends/meta-idle-monitor.c
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@@ -506,7 +506,7 @@ meta_idle_monitor_reset_idletime (MetaIdleMonitor *monitor)
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       if (watch->timeout_msec == 0)
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         {
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-          meta_idle_monitor_watch_fire ((MetaIdleMonitorWatch *) watch);
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+          meta_idle_monitor_watch_fire (watch);
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         }
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       else
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         {
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-- 
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2.23.0
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From f6c24dd45c14dd16d6878ebf170f8468ad3d47e1 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
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Date: Mon, 16 Sep 2019 16:36:51 +0200
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Subject: [PATCH 3/3] idle-monitor: Reset timeout before firing watch
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The watch might be removed during firing, meaning the source is
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destroyed after returning. Avoid use-after-free by unsetting the timeout
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before firing. Returning G_SOURCE_CONTINUE in that case is harmless, as
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source is destroyed.
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Fixes: https://gitlab.gnome.org/GNOME/mutter/issues/796
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https://gitlab.gnome.org/GNOME/mutter/merge_requests/799
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---
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 src/backends/meta-idle-monitor.c | 3 ++-
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 1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/backends/meta-idle-monitor.c b/src/backends/meta-idle-monitor.c
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index 3dbb89944..c6e814468 100644
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--- a/src/backends/meta-idle-monitor.c
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+++ b/src/backends/meta-idle-monitor.c
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@@ -319,9 +319,10 @@ idle_monitor_dispatch_timeout (GSource     *source,
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   if (ready_time > now)
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     return G_SOURCE_CONTINUE;
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-  meta_idle_monitor_watch_fire (watch);
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   g_source_set_ready_time (watch->timeout_source, -1);
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+  meta_idle_monitor_watch_fire (watch);
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+
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   return G_SOURCE_CONTINUE;
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 }
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-- 
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2.23.0
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