linux-kernel - Re: [PATCH 1/1] arm: print alloc free paths for address in registers

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Date:   Wed, 24 Feb 2021 14:03:47 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Maninder Singh <maninder1.s@...sung.com>
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org, vbabka@...e.cz,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, a.sahrawat@...sung.com,
        Vaneet Narang <v.narang@...sung.com>
Subject: Re: [PATCH 1/1] arm: print alloc free paths for address in registers

On Wed, Feb 24, 2021 at 06:07:34PM +0530, Maninder Singh wrote:
> +bool slab_page_object(unsigned long address, void **object, struct kmem_cache **cache)
> +{
> +	void *addr = (void *)address;
> +	struct page *page;
> +
> +	if ((addr >= (void *)PAGE_OFFSET) &&
> +			(addr < high_memory)) {
> +		page = virt_to_head_page(addr);

This check is not sufficient. There can be holes in the page array.
You need to use virt_addr_valid() to validate "addr".

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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