Am Donnerstag, 4. August 2016, 13:41:58 CEST schrieb Mat Martineau:
Hi Mat,
> > +
> > +long keyctl_dh_compute(struct keyctl_dh_params __user *params,
> > + char __user *buffer, size_t buflen,
> > + struct keyctl_kdf_params __user *kdf)
> > +{
> > + struct keyctl_kdf_params kdfcopy;
> > +
> > + if (!kdf)
> > + return __keyctl_dh_compute(params, buffer, buflen, NULL);
> > +
> > + if (copy_from_user(&kdfcopy, kdf, sizeof(kdfcopy)) != 0)
> > + return -EFAULT;
> > +
> > + return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy);
>
> I'd find this more readable if there was one call to __keyctl_dh_compute.
When trying to implement it, I think that it would even be more confusing,
because we need a conditional in any case. Do you like
return __keyctl_dh_compute(params, buffer, buflen, (kdf) ? &kdfcopy : NULL);
better than the already presented code? Besides, this would now imply that we
have two conditionals instead of one.
Ciao
Stephan
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