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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] net: check the length of the data before dereferencing
 it
Date: Sun, 01 Apr 2012 23:55:33 -0400 (EDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 02 Apr 2012 05:45:45 +0200

> Usually not a problem since we have many bytes after our head.

We always have bytes after the head, it's guarenteed, and whether it's
garbage bytes or skb_shared_info() it simply doesn't matter.