[PATCH] net/ipv6: Fix CALIPSO causing GPF with datagram support

[David Miller]

From: Richard Haines <richard_c_haines at btinternet.com>
Date: Mon,  5 Jun 2017 16:44:40 +0100

> When using CALIPSO with IPPROTO_UDP it is possible to trigger a GPF as the
> IP header may have moved.
> 
> Also update the payload length after adding the CALIPSO option.
> 
> Signed-off-by: Richard Haines <richard_c_haines at btinternet.com>

Applied and queued up for -stable, thank you Richard.
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