In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Wrap DCN32 phantom-plane allocation in DCRUNWITHPREEMPTIONENABLED [Why] dcn32validatebandwidth() wraps dcn32internalvalidatebw() with DCFPSTART()/DCFPEND(). In x86 non-RT, DCFPSTART takes fpregslock(), which disables local softirqs. The DML1 path through dcn32enablephantomplane() calls kvzalloc() to allocate ~335 KiB for dcplanestate. This triggers the vmalloc path, which calls BUGON(ininterrupt()) because it's invoked within the FPU-enabled (softirq disabled) region, leading to a kernel crash. [How] Wrap the dcstatecreatephantomplane() call with the DCRUNWITHPREEMPTION_ENABLED() macro to allow preemption during this memory allocation. (cherry picked from commit 885ccbef7b94a8b38f69c4211c679021aa27ad11)