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xcb: check validity of RandR output info before using it 

Fixes: QTBUG-128906
Pick-to: 6.7 6.5 6.2 5.15
Change-Id: Ibafdf4bb9c449b29437b0520299ab407238e5703
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit 439e19be17b9169f5786b2593e6d1ac6978bb84b)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
bb10
Liang Qi 2024-09-16 11:14:15 +02:00 committed by Qt Cherry-pick Bot
parent c5a27f4cfe
commit 21098bbb9c
1 changed files with 1 additions and 1 deletions
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2
src/plugins/platforms/xcb/qxcbconnection_screens.cpp
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@ -140,7 +140,7 @@ void QXcbConnection::updateScreens(const xcb_randr_notify_event_t *event)
// Screen has been disabled
auto outputInfo = Q_XCB_REPLY(xcb_randr_get_output_info, xcb_connection(),
output.output, output.config_timestamp);
if (outputInfo->crtc == XCB_NONE) {
if (!outputInfo || outputInfo->crtc == XCB_NONE) {
qCDebug(lcQpaScreen) << "output" << screen->name() << "has been disabled";
destroyScreen(screen);
} else {