linux-kernel - Re: [PATCH v2 5/7] mm/vmalloc: skip the uninitilized vmalloc areas

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Date:   Sat, 17 Dec 2022 12:07:27 +0000
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, urezki@...il.com,
        stephen.s.brennan@...cle.com, willy@...radead.org,
        akpm@...ux-foundation.org, hch@...radead.org
Subject: Re: [PATCH v2 5/7] mm/vmalloc: skip the uninitilized vmalloc areas

On Sat, Dec 17, 2022 at 09:54:33AM +0800, Baoquan He wrote:
> @@ -3617,6 +3617,11 @@ long vread(char *buf, char *addr, unsigned long count)
>  		if (!vm && !flags)
>  			continue;
>
> +		if (vm->flags & VM_UNINITIALIZED)
> +			continue;

This comes immediately after asserting that vm _might be null_. This surely must become:-

if (vm && vm->flags & VM_UNINITIALIZED)
        continue;