CVE-2023-53389

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/mediatek: dp: Only trigger DRM HPD events if bridge is attached<br /> <br /> The MediaTek DisplayPort interface bridge driver starts its interrupts<br /> as soon as its probed. However when the interrupts trigger the bridge<br /> might not have been attached to a DRM device. As drm_helper_hpd_irq_event()<br /> does not check whether the passed in drm_device is valid or not, a NULL<br /> pointer passed in results in a kernel NULL pointer dereference in it.<br /> <br /> Check whether the bridge is attached and only trigger an HPD event if<br /> it is.