Re: [PATCH] netlink: don't copy over empty attribute data

[David Miller]

From: Sasha Levin <sasha.levin@xxxxxxxxxx>
Date: Sun, 26 Oct 2014 19:32:42 -0400

> How so? GCC states clearly that you should *never* pass a NULL
> pointer there:
> 
> "The pointers passed to memmove (and similar functions in <string.h>) must
> be non-null even when nbytes==0" (https://gcc.gnu.org/gcc-4.9/porting_to.html).
> 
> Even if it doesn't dereference it, it can break somehow in a subtle way. Leaving
> the kernel code assuming that gcc (or any other compiler) would always behave
> the same in a situation that shouldn't occur.

Show me a legal way in which one could legally dereference the pointer
when length is zero, and I'll entertain this patch.
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