CVE-2025-38362 drm/amd/display: Add null pointer check for get_first_active_display()

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Add null pointer check for getfirstactivedisplay The function modhdcphdcp1enableencryption calls the function getfirstactivedisplay, but does not check its return value. The return value is a null pointer if the...