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Container: Don’t scroll to unset focus child coord

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In gtk_container_real_set_focus_child(), we try to scroll to the
position of the new :focus-child if we have h or v adjustments.

gtk_widget_translate_coordinates() returns FALSE if neither widget is
realized or in other situations that cause output parameters x and y not
to be set. Thus, if the caller did not initialise x/y and uses them even
if the function returned FALSE, they are using uninitialised variables.

In gtk_container_real_set_focus_child(), we did not check the return
value but merrily went ahead and used x and y regardless. This is UB, as
revealed by Valgrind, as well as being pointless.

The trivial fix is to exit early if (!gtk_widget_translate_coordinates).

https://bugzilla.gnome.org/show_bug.cgi?id=776909
This commit is contained in:
Daniel Boles 2017-08-07 18:32:57 +01:00
parent c4865bed43
commit 23b6699ec3
1 changed files with 4 additions and 4 deletions
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8
gtk/gtkcontainer.c
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@ -2038,8 +2038,7 @@ gtk_container_real_set_focus_child (GtkContainer *container,
g_return_if_fail (GTK_IS_CONTAINER (container));
g_return_if_fail (focus_child == NULL || GTK_IS_WIDGET (focus_child));
/* check for h/v adjustments
*/
/* Check for h/v adjustments and scroll to show the focus child if possible */
if (focus_child)
{
GtkAdjustment *hadj;
@ -2056,8 +2055,9 @@ gtk_container_real_set_focus_child (GtkContainer *container,
while (gtk_widget_get_focus_child (child))
child = gtk_widget_get_focus_child (child);
gtk_widget_translate_coordinates (child, focus_child,
0, 0, &x, &y);
if (!gtk_widget_translate_coordinates (child, focus_child,
0, 0, &x, &y))
return;
_gtk_widget_get_allocation (focus_child, &allocation);
x += allocation.x;