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fix possible crashes in case QCursor is used when qt_x11Data is null

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Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2023-08-22 11:13:11 +07:00
parent 1d8cc1be87
commit 48f864a5f4
1 changed files with 16 additions and 7 deletions
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23
src/gui/kernel/qcursor_x11.cpp
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@ -114,7 +114,7 @@ Qt::HANDLE QCursor::handle() const
return 0;
}
Display *dpy = qt_x11Data->display;
Display *dpy = (qt_x11Data ? qt_x11Data->display : nullptr);
if (!dpy) {
return 0;
}
@ -185,11 +185,14 @@ Qt::HANDLE QCursor::handle() const
*/
int QCursor::x11Screen()
{
Display *dpy = (qt_x11Data ? qt_x11Data->display : nullptr);
if (!dpy) {
return -1;
}
Window root;
Window child;
int root_x, root_y, win_x, win_y;
uint buttons;
Display* dpy = qt_x11Data->display;
for (int i = 0; i < ScreenCount(dpy); ++i) {
if (XQueryPointer(dpy, QX11Info::appRootWindow(i), &root, &child, &root_x, &root_y,
&win_x, &win_y, &buttons)) {
@ -202,11 +205,14 @@ int QCursor::x11Screen()
QPoint QCursor::pos()
{
Display *dpy = (qt_x11Data ? qt_x11Data->display : nullptr);
if (!dpy) {
return QPoint();
}
Window root;
Window child;
int root_x, root_y, win_x, win_y;
uint buttons;
Display* dpy = qt_x11Data->display;
for (int i = 0; i < ScreenCount(dpy); ++i) {
if (XQueryPointer(dpy, QX11Info::appRootWindow(i), &root, &child, &root_x, &root_y,
&win_x, &win_y, &buttons)) {
@ -218,18 +224,21 @@ QPoint QCursor::pos()
void QCursor::setPos(int x, int y)
{
Display *dpy = (qt_x11Data ? qt_x11Data->display : nullptr);
if (!dpy) {
return;
}
QPoint current;
QPoint target(x, y);
// this is copied from pos(), since we need the screen number for the correct
// root window in the XWarpPointer call
Window root;
Window child;
int root_x, root_y, win_x, win_y;
uint buttons;
Display* dpy = qt_x11Data->display;
int screen;
for (screen = 0; screen < ScreenCount(dpy); ++screen) {
int screen = 0;
for (; screen < ScreenCount(dpy); ++screen) {
if (XQueryPointer(dpy, QX11Info::appRootWindow(screen), &root, &child, &root_x, &root_y,
&win_x, &win_y, &buttons)) {
current = QPoint(root_x, root_y);