In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Add null pointer check in modhdcphdcp1createsession() The function modhdcphdcp1createsession() calls the function getfirstactivedisplay(), but does not check its return value. The return value is a null pointer if the display list is empty. This will lead to a null pointer dereference. Add a null pointer check for getfirstactivedisplay() and return MODHDCPSTATUSDISPLAYNOTFOUND if the function return null. This is similar to the commit c3e9826a2202 ("drm/amd/display: Add null pointer check for getfirstactivedisplay()"). (cherry picked from commit 5e43eb3cd731649c4f8b9134f857be62a416c893)