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Date:   Tue, 30 Apr 2019 14:23:46 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <steffen.klassert@...unet.com>, <herbert@...dor.apana.org.au>,
        <davem@...emloft.net>, <kuznet@....inr.ac.ru>,
        <yoshfuji@...ux-ipv6.org>
CC:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH] vti4: Fix error path in vti_init and vti_fini

Well, there has a same fix in ipsec tree, Pls ignore this.

On 2019/4/30 11:36, YueHaibing wrote:
> KASAN report this:
> 
> BUG: unable to handle kernel paging request at fffffbfff8280cc7
> PGD 237fe4067 P4D 237fe4067 PUD 237e60067 PMD 1ebfd0067 PTE 0
> Oops: 0000 [#1] SMP KASAN PTI
> CPU: 0 PID: 8156 Comm: syz-executor.0 Tainted: G         C        5.1.0-rc3+ #8
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
> RIP: 0010:xfrm4_tunnel_register+0xb3/0x1f0 [tunnel4]
> Code: e8 03 42 80 3c 28 00 0f 85 25 01 00 00 48 8b 5d 00 48 85 db 0f 84 a8 00 00 00 e8 08 cd b3 f3 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 74 08 3c 03 0f 8e 04 01 00 00 44 8b 63 18 45
> RSP: 0018:ffff8881b65bf9a0 EFLAGS: 00010a02
> RAX: 1ffffffff8280cc7 RBX: ffffffffc1406620 RCX: ffffffff8d8880a8
> RDX: 0000000000031712 RSI: ffffc900014bf000 RDI: ffffffffc1406638
> RBP: ffffffffc108a4a0 R08: fffffbfff8211401 R09: fffffbfff8211401
> R10: ffff8881b65bf9a0 R11: fffffbfff8211400 R12: ffffffffc1c08000
> R13: dffffc0000000000 R14: 0000000000000000 R15: ffffffffc1bfe620
> FS:  00007f5f07be3700(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: fffffbfff8280cc7 CR3: 00000001e8d00004 CR4: 00000000007606f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
>  ? 0xffffffffc1c08000
>  vti_init+0x9d/0x1000 [ip_vti]
>  do_one_initcall+0xbc/0x47d init/main.c:901
>  do_init_module+0x1b5/0x547 kernel/module.c:3456
>  load_module+0x6405/0x8c10 kernel/module.c:3804
>  __do_sys_finit_module+0x162/0x190 kernel/module.c:3898
>  do_syscall_64+0x9f/0x450 arch/x86/entry/common.c:290
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> 
> commit dd9ee3444014 ("vti4: Fix a ipip packet processing bug
> in 'IPCOMP' virtual tunnel") misplace xfrm4_tunnel_deregister in
> vti_init and forgot to add cleanup in vti_fini.
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: dd9ee3444014 ("vti4: Fix a ipip packet processing bug in 'IPCOMP' virtual tunnel")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  net/ipv4/ip_vti.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
> index 68a21bf..b6235ca 100644
> --- a/net/ipv4/ip_vti.c
> +++ b/net/ipv4/ip_vti.c
> @@ -659,9 +659,9 @@ static int __init vti_init(void)
>  	return err;
>  
>  rtnl_link_failed:
> -	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
> -xfrm_tunnel_failed:
>  	xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
> +xfrm_tunnel_failed:
> +	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
>  xfrm_proto_comp_failed:
>  	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
>  xfrm_proto_ah_failed:
> @@ -676,6 +676,7 @@ static int __init vti_init(void)
>  static void __exit vti_fini(void)
>  {
>  	rtnl_link_unregister(&vti_link_ops);
> +	xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
>  	xfrm4_protocol_deregister(&vti_ipcomp4_protocol, IPPROTO_COMP);
>  	xfrm4_protocol_deregister(&vti_ah4_protocol, IPPROTO_AH);
>  	xfrm4_protocol_deregister(&vti_esp4_protocol, IPPROTO_ESP);
> 

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