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SubjectRe: null pointer questions
On Fri, 2 Nov 2001, Roman Zippel wrote:

> Hi,
>
> On Thu, 1 Nov 2001, Ken Ashcraft wrote:
>
> > 1. If I pass size 0 to kmalloc, what does it return?
>
> AFAIK size is always rounded up, so you get the smallest possible
> allocation unit.
>
> > 2. What happens if I pass a null pointer as the destination parameter
> > to copy_from_user? Does copy_from_user handle it safely or will the
> > kernel seg fault?
>
> The kernel won't crash, but it might fail (depending on whether 0 is a
> valid user space address or not).
>
> bye, Roman
>
>
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