From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [net-next] ipv6: sr: Extract the right key values for
 "seg6_make_flowlabel"
Date: Fri, 27 Apr 2018 13:59:07 -0400 (EDT)
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From: Ahmed Abdelsalam <amsalam20@gmail.com>
Date: Thu, 26 Apr 2018 16:11:11 +0200

> @@ -119,6 +119,9 @@ int seg6_do_srh_encap(struct sk_buff *skb, struct ipv6_sr_hdr *osrh, int proto)
>  	int hdrlen, tot_len, err;
>  	__be32 flowlabel;
>  
> +	inner_hdr = ipv6_hdr(skb);

You have to make this assignment after, not before, the skb_cow_header()
call.  Otherwise this point can be pointing to freed up memory.