tcp: fix potential race in tcp_v6_syn_recv_sock()

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                        "include/net/inet_connection_sock.h",
                        "include/net/tcp.h",
                        "net/ipv4/syncookies.c",
                        "net/ipv4/tcp_fastopen.c",
                        "net/ipv4/tcp_ipv4.c",
                        "net/ipv4/tcp_minisocks.c",
                        "net/ipv6/tcp_ipv6.c",
                        "net/mptcp/subflow.c",
                        "net/smc/af_smc.c"
                    ],
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                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/inet_connection_sock.h",
                        "include/net/tcp.h",
                        "net/ipv4/syncookies.c",
                        "net/ipv4/tcp_fastopen.c",
                        "net/ipv4/tcp_ipv4.c",
                        "net/ipv4/tcp_minisocks.c",
                        "net/ipv6/tcp_ipv6.c",
                        "net/mptcp/subflow.c",
                        "net/smc/af_smc.c"
                    ],
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                }