fix crash problem when toa is used on centos 7.6

[goecho]

fix crash problem when toa is used on centos 7.6.

[snailq]

加载支持ipv6的toa，模块的时候系统会crash掉
麻烦大神帮看看是哪里的问题？可以修复吗3Q！！
master和devel的里的toa都测试过

有问题的系统版本centos7.6 kernel 3.10.0-957.el7.x86_64
无问题的系统版本 centos7.4 kernel 3.10.0-693.el7.x86_64/centos7.2 kernel 3.10.0-327.el7.x86_64

[ 9.758912] conntrack: generic helper won't handle protocol 47. Please consider loading the specific helper module.
[ 40.546277] ixgbe 0000:04:00.0 eth0: detected SFP+: 6
[ 40.685911] ixgbe 0000:04:00.0 eth0: NIC Link is Up 10 Gbps, Flow Control: RX/TX
[ 312.294670] toa: loading out-of-tree module taints kernel.
[ 312.294847] toa: module verification failed: signature and/or required key missing - tainting kernel
[ 312.295206] TOA: TOA 2.0.0.0 by qlb of iqiyi.
[ 312.298430] TOA: CPU [25] sk_data_ready_addr = kallsyms_lookup_name(sock_def_readable) = 18446744072189236224
[ 312.310189] BUG: unable to handle kernel paging request at ffffffffa58a15b8
[ 312.310227] IP: [] toa_init+0x29d/0x1000 [toa]
[ 312.310260] PGD 1864c14067 PUD 1864c15063 PMD 80000018648000e1
[ 312.310290] Oops: 0003 [#1] SMP
[ 312.310309] Modules linked in: toa(OE+) tcp_diag udp_diag inet_diag unix_diag iTCO_wdt iTCO_vendor_support sb_edac intel_powerclamp coretemp intel_rapl iosf_mbi kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd mgag200 i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm sg ipmi_si pcspkr drm_panel_orientation_quirks ipmi_devintf hpilo ipmi_msghandler ioatdma i2c_i801 lpc_ich pcc_cpufreq hpwdt wmi nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic crct10dif_pclmul crct10dif_common crc32c_intel serio_raw ixgbe hpsa mdio ptp pps_core scsi_transport_sas dca
[ 312.310692] CPU: 25 PID: 25530 Comm: insmod Kdump: loaded Tainted: G OE ------------ 3.10.0-957.el7.x86_64 #1
[ 312.310736] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, BIOS P89 10/25/2017
[ 312.310769] task: ffff8d8f69385140 ti: ffff8d8f694b0000 task.ti: ffff8d8f694b0000
[ 312.310801] RIP: 0010:[] [] toa_init+0x29d/0x1000 [toa]
[ 312.310838] RSP: 0018:ffff8d8f694b3d28 EFLAGS: 00010246
[ 312.310861] RAX: 0000000000000000 RBX: ffffffffa5d58660 RCX: 0000000000000002
[ 312.310889] RDX: ffffffffc01ac0a0 RSI: ffffffffa5d17040 RDI: ffffffffa5d17060
[ 312.310918] RBP: ffff8d8f694b3d30 R08: ffffffffc01ac0a0 R09: ffffffffa59b3488
[ 312.310947] R10: ffffffffa59b3488 R11: 0000000000003041 R12: ffff8d9efff4c3c0
[ 312.310979] R13: ffffffffc03c3000 R14: 0000000000000000 R15: ffffffffc058a100
[ 312.311012] FS: 00007f3cc43f6740(0000) GS:ffff8d9ebf440000(0000) knlGS:0000000000000000
[ 312.311044] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 312.311068] CR2: ffffffffa58a15b8 CR3: 0000002013706000 CR4: 00000000001607e0
[ 312.311097] Call Trace:
[ 312.311114] [] do_one_initcall+0xba/0x240
[ 312.311146] [] load_module+0x272c/0x2bc0
[ 312.311173] [] ? ddebug_proc_write+0x100/0x100
[ 312.311200] [] ? copy_module_from_fd.isra.44+0x53/0x150
[ 312.311230] [] SyS_finit_module+0xa6/0xd0
[ 312.311256] [] system_call_fastpath+0x22/0x27
[ 312.311280] Code: 54 c0 e8 c7 65 2b e5 85 c0 74 20 e8 ee fb 28 e5 85 c0 0f 84 e0 fe ff ff 48 c7 c7 48 92 54 c0 31 c0 e8 6f 83 39 e5 e9 cd fe ff ff <48> c7 05 10 e3 4d e5 d0 83 54 c0 e8 c3 fb 28 e5 85 c0 74 23 48
[ 312.311469] RIP [] toa_init+0x29d/0x1000 [toa]
[ 312.311498] RSP
[ 312.311514] CR2: ffffffffa58a15b8

[snailq]

验证修复成功 👍🏻