linux-kernel - Re: NULL deref in drivers/md/dm-crypt.c:crypt

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Date:	Fri, 11 Feb 2011 08:37:55 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Jesper Juhl <jj@...osbits.net>
CC:	linux-kernel@...r.kernel.org, Alexander Kjeldaas <astor@...t.no>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: NULL deref in drivers/md/dm-crypt.c:crypt_convert()

On 02/10/2011 08:14 PM, Jesper Juhl wrote:
> On Sun, 6 Feb 2011, Milan Broz wrote:
> 
> If you have a coverity scan account it is CID 40766. But since you ask I 
> assume you do not have an account, so I've also pasted the output from 
> their web interface here :

Thanks.

I would say that the checker has problem to follow per cpu pointers...

In this case
static struct crypt_cpu *this_crypt_config(struct crypt_config *cc)
{
        return this_cpu_ptr(cc->cpu);

Otherwise it must see that the struct is allocated in
crypt_alloc_req(cc, ctx);

And mempool allocation should never return NULL here.

Milan
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