Memory leaks in *clock_source_create() functions under
drivers/gpu/drm/amd/display/dc in the Linux kernel before 5.3.8 allow
attackers to cause a denial of service (memory consumption). This affects
the dce112_clock_source_create() function in
drivers/gpu/drm/amd/display/dc/dce112/dce112_resource.c, the
dce100_clock_source_create() function in
drivers/gpu/drm/amd/display/dc/dce100/dce100_resource.c, the
dcn10_clock_source_create() function in
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c, the
dcn20_clock_source_create() function in
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c, the
dce120_clock_source_create() function in
drivers/gpu/drm/amd/display/dc/dce120/dce120_resource.c, the
dce110_clock_source_create() function in
drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c, and the
dce80_clock_source_create() function in
drivers/gpu/drm/amd/display/dc/dce80/dce80_resource.c, aka
CID-055e547478a1.

It was discovered that the AMD Display Engine Driver in the Linux kernel
did not properly deallocate memory in certain error conditions. A local
attack could use this to cause a denial of service (memory exhaustion).