>> 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)?


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