Fix a problem in GLib/gio which caused gnome-shell and others to crash.

The problem happened when, for example, a packages was installed/deinstall
that placed a file in ${LOCALBASE}/share/applications.

Thanks to ajacoutot@openbsd.org and mpi@openbsd.org for bringing these
patches to my attention.

Obtained from:	https://bugzilla.gnome.org/show_bug.cgi?id=739424
		https://bugzilla.gnome.org/show_bug.cgi?id=778515
MFH:		2017Q2

3 files changed, 115 insertions, 0 deletions

diff --git a/devel/glib20/Makefile b/devel/glib20/Makefile
index 2446716e3d04..cb638b3a26c7 100644
--- a/devel/glib20/Makefile
+++ b/devel/glib20/Makefile
@@ -3,6 +3,7 @@
 
 PORTNAME=	glib
 PORTVERSION=	2.50.2
+PORTREVISION=	1
 PORTEPOCH=	1
 CATEGORIES=	devel
 MASTER_SITES=	GNOME
diff --git a/devel/glib20/files/patch-bug739424 b/devel/glib20/files/patch-bug739424
new file mode 100644
index 000000000000..c5b8d82925b1
--- /dev/null
+++ b/devel/glib20/files/patch-bug739424
@@ -0,0 +1,59 @@
+From 22656f16c29591207c667362e2a42fd348fe8494 Mon Sep 17 00:00:00 2001
+From: Martin Pieuchot <mpi@openbsd.org>
+Date: Fri, 28 Apr 2017 15:06:52 +0200
+Subject: [PATCH] kqueue: fix use-after-free of ``kqueue_sub''.
+
+Since ``kqueue_sub'' are not refcounted it is common to see a thread
+freeing one of them while another thread is manipulating them.  This
+leads to crashs reported in:
+	https://bugzilla.gnome.org/show_bug.cgi?id=739424
+
+To prevent such crash, make sure the threads are holding ``hash_lock''
+when manipulating such items.
+---
+ gio/kqueue/kqueue-helper.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/gio/kqueue/kqueue-helper.c b/gio/kqueue/kqueue-helper.c
+index d4e66cd4d..84b9ef164 100644
+--- gio/kqueue/kqueue-helper.c
++++ gio/kqueue/kqueue-helper.c
+@@ -291,10 +291,10 @@ process_kqueue_notifications (GIOChannel   *gioc,
+ 
+   G_LOCK (hash_lock);
+   sub = (kqueue_sub *) g_hash_table_lookup (subs_hash_table, GINT_TO_POINTER (n.fd));
+-  G_UNLOCK (hash_lock);
+ 
+   if (sub == NULL)
+     {
++      G_UNLOCK (hash_lock);
+       KH_W ("Got a notification for a deleted or non-existing subscription %d",
+              n.fd);
+       return TRUE;
+@@ -336,6 +336,7 @@ process_kqueue_notifications (GIOChannel   *gioc,
+         g_file_monitor_source_handle_event (source, mask, NULL, NULL, NULL, g_get_monotonic_time ());
+     }
+ 
++  G_UNLOCK (hash_lock);
+   return TRUE;
+ }
+ 
+@@ -451,13 +452,14 @@ _kh_start_watching (kqueue_sub *sub)
+ 
+   G_LOCK (hash_lock);
+   g_hash_table_insert (subs_hash_table, GINT_TO_POINTER (sub->fd), sub);
+-  G_UNLOCK (hash_lock);
+ 
+   _kqueue_thread_push_fd (sub->fd);
+   
+   /* Bump the kqueue thread. It will pick up a new sub entry to monitor */
+   if (!_ku_write (kqueue_socket_pair[0], "A", 1))
+     KH_W ("Failed to bump the kqueue thread (add fd, error %d)", errno);
++  G_UNLOCK (hash_lock);
++
+   return TRUE;
+ }
+ 
+-- 
+2.12.2
+
diff --git a/devel/glib20/files/patch-bug778515 b/devel/glib20/files/patch-bug778515
new file mode 100644
index 000000000000..3224f8836c48
--- /dev/null
+++ b/devel/glib20/files/patch-bug778515
@@ -0,0 +1,55 @@
+From e305fe971e4647d971428a772b7290b9c308a96f Mon Sep 17 00:00:00 2001
+From: Steven McDonald <steven@steven-mcdonald.id.au>
+Date: Sun, 12 Feb 2017 11:02:55 +1100
+Subject: gio: Always purge kqueue subs from missing list
+
+Previously, _kh_cancel_sub assumed that it only needed to call
+_km_remove if sub did not exist in subs_hash_table. This is erroneous
+because the complementary operation, _km_add_missing, can be called
+from process_kqueue_notifications, in which context sub can *only* have
+come from subs_hash_table.
+
+Since _km_remove is implemented using g_slist_remove, which is
+documented to be a noop if the list does not contain the element to be
+removed, it is safe to call _km_remove unconditionally here.
+
+https://bugzilla.gnome.org/show_bug.cgi?id=778515
+---
+ gio/kqueue/kqueue-helper.c | 15 +++++----------
+ 1 file changed, 5 insertions(+), 10 deletions(-)
+
+diff --git a/gio/kqueue/kqueue-helper.c b/gio/kqueue/kqueue-helper.c
+index 4671396..d4e66cd 100644
+--- gio/kqueue/kqueue-helper.c
++++ gio/kqueue/kqueue-helper.c
+@@ -498,22 +498,17 @@ _kh_add_sub (kqueue_sub *sub)
+ gboolean
+ _kh_cancel_sub (kqueue_sub *sub)
+ {
+-  gboolean missing = FALSE;
++  gboolean removed = FALSE;
+   g_assert (kqueue_socket_pair[0] != -1);
+   g_assert (sub != NULL);
+ 
++  _km_remove (sub);
++
+   G_LOCK (hash_lock);
+-  missing = !g_hash_table_remove (subs_hash_table, GINT_TO_POINTER (sub->fd));
++  removed = g_hash_table_remove (subs_hash_table, GINT_TO_POINTER (sub->fd));
+   G_UNLOCK (hash_lock);
+ 
+-  if (missing)
+-    {
+-      /* If there were no fd for this subscription, file is still
+-       * missing. */
+-      KH_W ("Removing subscription from missing");
+-      _km_remove (sub);
+-    }
+-  else
++  if (removed)
+     {
+       /* fd will be closed in the kqueue thread */
+       _kqueue_thread_remove_fd (sub->fd);
+-- 
+cgit v0.12
+