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SubjectRe: null pointer questions

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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