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keybindings: fix invalid read after a keybinding is removed

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The handler pointer is dangling in MetaKeyBinding until
rebuild_key_binding_table() is run, so we can't dereference it.
Because we only need the flags at ungrab time, store a copy
in the MetaKeyBinding structure.

https://bugzilla.gnome.org/show_bug.cgi?id=724402
This commit is contained in:
Giovanni Campagna 2014-02-26 00:47:11 +01:00
parent 1e01a55cdc
commit 682d6f9ee2
2 changed files with 5 additions and 1 deletions
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1
src/core/keybindings-private.h
View File

@ -47,6 +47,7 @@ struct _MetaKeyBinding
KeyCode keycode;
unsigned int mask;
MetaVirtualModifier modifiers;
gint flags;
MetaKeyHandler *handler;
};

5
src/core/keybindings.c
View File

@ -607,6 +607,7 @@ rebuild_binding_table (MetaDisplay *display,
(*bindings_p)[i].name = pref->name;
(*bindings_p)[i].handler = handler;
(*bindings_p)[i].flags = handler->flags;
(*bindings_p)[i].keysym = combo->keysym;
(*bindings_p)[i].keycode = combo->keycode;
(*bindings_p)[i].modifiers = combo->modifiers;
@ -623,6 +624,7 @@ rebuild_binding_table (MetaDisplay *display,
(*bindings_p)[i].name = pref->name;
(*bindings_p)[i].handler = handler;
(*bindings_p)[i].flags = handler->flags;
(*bindings_p)[i].keysym = combo->keysym;
(*bindings_p)[i].keycode = combo->keycode;
(*bindings_p)[i].modifiers = combo->modifiers |
@ -649,6 +651,7 @@ rebuild_binding_table (MetaDisplay *display,
(*bindings_p)[i].name = grab->name;
(*bindings_p)[i].handler = handler;
(*bindings_p)[i].flags = handler->flags;
(*bindings_p)[i].keysym = grab->combo->keysym;
(*bindings_p)[i].keycode = grab->combo->keycode;
(*bindings_p)[i].modifiers = grab->combo->modifiers;
@ -1164,7 +1167,7 @@ change_binding_keygrabs (MetaKeyBinding *bindings,
while (i < n_bindings)
{
if (!!binding_per_window ==
!!(bindings[i].handler->flags & META_KEY_BINDING_PER_WINDOW) &&
!!(bindings[i].flags & META_KEY_BINDING_PER_WINDOW) &&
bindings[i].keycode != 0)
{
meta_change_keygrab (display, xwindow, grab,