net/llc: avoid BUG_ON() in skb_orphan()
It seems nobody used LLC since linux-3.12. Fortunately fuzzers like syzkaller still know how to run this code, otherwise it would be no fun. Setting skb->sk without skb->destructor leads to all kinds of bugs, we now prefer to be very strict about it. Ideally here we would use skb_set_owner() but this helper does not exist yet, only CAN seems to have a private helper for that. Fixes: 376c7311 ("net: add a temporary sanity check in skb_orphan()") Signed-off-by: NEric Dumazet <edumazet@google.com> Reported-by: NAndrey Konovalov <andreyknvl@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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