CVE-2024-50117

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/amd: Guard against bad data for ATIF ACPI method<br /> <br /> If a BIOS provides bad data in response to an ATIF method call<br /> this causes a NULL pointer dereference in the caller.<br /> <br /> ```<br /> ? show_regs (arch/x86/kernel/dumpstack.c:478 (discriminator 1))<br /> ? __die (arch/x86/kernel/dumpstack.c:423 arch/x86/kernel/dumpstack.c:434)<br /> ? page_fault_oops (arch/x86/mm/fault.c:544 (discriminator 2) arch/x86/mm/fault.c:705 (discriminator 2))<br /> ? do_user_addr_fault (arch/x86/mm/fault.c:440 (discriminator 1) arch/x86/mm/fault.c:1232 (discriminator 1))<br /> ? acpi_ut_update_object_reference (drivers/acpi/acpica/utdelete.c:642)<br /> ? exc_page_fault (arch/x86/mm/fault.c:1542)<br /> ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623)<br /> ? amdgpu_atif_query_backlight_caps.constprop.0 (drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c:387 (discriminator 2)) amdgpu<br /> ? amdgpu_atif_query_backlight_caps.constprop.0 (drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c:386 (discriminator 1)) amdgpu<br /> ```<br /> <br /> It has been encountered on at least one system, so guard for it.<br /> <br /> (cherry picked from commit c9b7c809b89f24e9372a4e7f02d64c950b07fdee)