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

On Thu, Feb 01, 2018 at 11:22:55PM +0300, Andrey Ryabinin wrote:

...

...

• vm = find_vm_area((void *)shadow_start);
  

• if (vm)
  

• 	vfree((void *)shadow_start);
  

• }

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

It's not. shadow_start is never vmalloc address.

I'm confused. How can you call vfree() on something that isn't a vmalloc address?