linux-kernel - Re: [PATCH] mm/vmalloc: fix unsafe dereference of potential null ptr in vmalloc

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Message-ID: <Y++ewLr68kfX6q9r@infradead.org>
Date:   Fri, 17 Feb 2023 07:35:28 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Alexander Sapozhnikov <alsp705@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] mm/vmalloc: fix unsafe dereference of potential null ptr
 in vmalloc_init()

On Fri, Feb 17, 2023 at 03:51:05PM +0300, Alexander Sapozhnikov wrote:
> Return value of a function 'kmem_cache_create' is dereferenced 
> at vmalloc.c:2444 without checking for null, but it is usually 
> checked for this function.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.

I think that checker needs to learn about SLAB_PANIC..