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Date: Thu, 1 Feb 2018 11:57:57 -0800
From: Matthew Wilcox <willy@infradead.org>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Paul Menzel <pmenzel+linux-kasan-dev@molgen.mpg.de>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>, kasan-dev@googlegroups.com,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        stable@vger.kernel.org
Subject: Re: [PATCH] mm/kasan: Don't vfree() nonexistent vm_area.
Message-ID: <20180201195757.GC20742@bombadil.infradead.org>
References: <12c9e499-9c11-d248-6a3f-14ec8c4e07f1@molgen.mpg.de>
 <20180201163349.8700-1-aryabinin@virtuozzo.com>
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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' ...