linux-kernel - Re: [0/8] target-iSCSI: Adjustments for several function implementations

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Date:   Fri, 23 Feb 2018 12:50:50 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        target-devel@...r.kernel.org
Cc:     David Disseldorp <ddiss@...e.de>, kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, linux-scsi@...r.kernel.org
Subject: Re: [0/8] target-iSCSI: Adjustments for several function
 implementations

>> Can a passed null pointer really work in this function?
>>
>> https://elixir.bootlin.com/linux/v4.16-rc2/source/include/crypto/hash.h#L684
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/crypto/hash.h?id=0f9da844d87796ac31b04e81ee95e155e9043132#n751
>>
>> static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm)
>> {
>> 	return &tfm->base;
>> }
> 
> Yes.  It's not a dereference,

Do any processors treat the zero address still special there?


> it's just doing pointer math to get the address.

Can eventually happen anything unexpected?


Can it be nicer to avoid such a software behaviour concern generally
just by adjusting a few jump labels (as I proposed it)?

Regards,
Markus