Re: [PATCH] mm/kasan: Don't vfree() nonexistent vm_area.

[Matthew Wilcox]

On Thu, Feb 01, 2018 at 07:33:49PM +0300, Andrey Ryabinin wrote:
> +     case MEM_OFFLINE: {
> +             struct vm_struct *vm;
> +
> +             /*
> +              * Only hot-added memory have vm_area. Freeing shadow
> +              * mapped during boot would be tricky, so we'll just
> +              * have to keep it.
> +              */
> +             vm = find_vm_area((void *)shadow_start);
> +             if (vm)
> +                     vfree((void *)shadow_start);
> +     }

This looks like a complicated way to spell 'is_vmalloc_addr' ...