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

[Matthew Wilcox]

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?