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Add safety check for QueryTree

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xcb_qeuery_tree should fail and we should not just assume that the
call succeeds.

Crash reported by Harald Sitter.
This commit is contained in:
Martin Gräßlin 2015-03-20 12:39:33 +01:00
parent e2c422dcb5
commit 7d797387d7
2 changed files with 17 additions and 15 deletions
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2
layers.cpp
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@ -668,6 +668,7 @@ ToplevelList Workspace::xStackingOrder() const
foreach (Toplevel * c, stacking_order) foreach (Toplevel * c, stacking_order)
x_stacking.append(c); x_stacking.append(c);
if (!tree.isNull()) {
xcb_window_t *windows = tree.children(); xcb_window_t *windows = tree.children();
const auto count = tree->children_len; const auto count = tree->children_len;
int foundUnmanagedCount = unmanaged.count(); int foundUnmanagedCount = unmanaged.count();
@ -686,6 +687,7 @@ ToplevelList Workspace::xStackingOrder() const
break; break;
} }
} }
}
if (m_compositor) { if (m_compositor) {
const_cast< Workspace* >(this)->m_compositor->checkUnredirect(); const_cast< Workspace* >(this)->m_compositor->checkUnredirect();
} }

2
xcbutils.h
View file

@ -574,7 +574,7 @@ public:
explicit Tree(WindowId window) : Wrapper<TreeData, xcb_window_t>(window) {} explicit Tree(WindowId window) : Wrapper<TreeData, xcb_window_t>(window) {}
inline WindowId *children() { inline WindowId *children() {
if (data()->children_len == 0) { if (isNull() || data()->children_len == 0) {
return nullptr; return nullptr;
} }
return xcb_query_tree_children(data()); return xcb_query_tree_children(data());