kernel: Use after free in array_map_alloc

Use after free vulnerability was found in percpu using previously allocated memory in bpf. First allocpercpugfp is called, then the memory is freed with freepercpu which triggers async pcpubalancework and then pcpuextendareamap could use a chunk after it has been freed...

kernel: Use after free in array_map_alloc

Use after free vulnerability was found in percpu using previously allocated memory in bpf. First allocpercpugfp is called, then the memory is freed with freepercpu which triggers async pcpubalancework and then pcpuextendareamap could use a chunk after it has been freed...