net: fix geneve_opt length integer overflow

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                        "net/netfilter/nft_tunnel.c",
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                        "net/sched/cls_flower.c"
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{
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                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv4/ip_tunnel_core.c",
                        "net/netfilter/nft_tunnel.c",
                        "net/sched/act_tunnel_key.c",
                        "net/sched/cls_flower.c"
                    ],
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                }