From: wenxu <wenxu@ucloud.cn>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
rong.a.chen@intel.com,
Network Development <netdev@vger.kernel.org>,
Stephen Rothwell <sfr@canb.auug.org.au>, LKP <lkp@01.org>
Subject: Re: [PATCH net-next] ip_tunnel: Fix DST_METADATA dst_entry handle in tnl_update_pmtu
Date: Sun, 17 Feb 2019 11:45:38 +0800 [thread overview]
Message-ID: <3c34b930-446f-a7de-bf54-5ee19b5bbd93@ucloud.cn> (raw)
In-Reply-To: <41cd7ba4-7e87-3a3e-ad77-6caf0b46cbd1@ucloud.cn>
On 2019/2/17 上午11:35, wenxu wrote:
> On 2019/2/17 上午12:34, Alexei Starovoitov wrote:
>> On Sat, Feb 16, 2019 at 2:11 AM <wenxu@ucloud.cn> wrote:
>>> From: wenxu <wenxu@ucloud.cn>
>>>
>>> BUG report in selftests: bpf: test_tunnel.sh
>>>
>>> Testing IPIP tunnel...
>>> BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
>>> PGD 0 P4D 0
>>> Oops: 0010 [#1] SMP PTI
>>> CPU: 0 PID: 16822 Comm: ping Not tainted 5.0.0-rc3-00352-gc8b34e6 #1
>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
>>> RIP: 0010: (null)
>>> Code: Bad RIP value.
>>> RSP: 0018:ffffc9000104f9c8 EFLAGS: 00010286
>>> RAX: 0000000000000000 RBX: ffffe8ffffc071a8 RCX: 0000000000000000
>>> RDX: ffff888054e33000 RSI: ffff88807796f500 RDI: ffffe8ffffc07130
>>> RBP: ffff88807796f500 R08: ffff88806da4f0a0 R09: 0000000000000000
>>> R10: 0000000000000004 R11: ffff888054e33000 R12: 0000000000000054
>>> R13: ffff88805e714000 R14: ffff88806da4f0a0 R15: 0000000000000000
>>> FS: 00007f4c00431500(0000) GS:ffff88813fc00000(0000) knlGS:0000000000000000
>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> CR2: ffffffffffffffd6 CR3: 000000008276e000 CR4: 00000000000406f0
>>> Call Trace:
>>> ? tnl_update_pmtu+0x21b/0x250 [ip_tunnel]
>>> ? ip_md_tunnel_xmit+0x1b7/0xdc0 [ip_tunnel]
>>> ? ipip_tunnel_xmit+0x90/0xc0 [ipip]
>>> ? dev_hard_start_xmit+0x98/0x210
>>> ? __dev_queue_xmit+0x6a9/0x8e0
>>>
>>> The bpf program set tunnel_key through bpf_skb_set_tunnel_key which will
>>> drop the old dst_entry and create a DST_METADATA dst_entry. It will lead
>>> the tunnel_update_pmtu operator the dst_entry incorrect. So It should be
>>> check the dst_entry is valid.
>>>
>>> Fixes: c8b34e680a09 ("ip_tunnel: Add tnl_update_pmtu in ip_md_tunnel_xmit")
>>> Signed-off-by: wenxu <wenxu@ucloud.cn>
>> different fix for this issue was sent earlier:
>> https://patchwork.ozlabs.org/patch/1042687/
>> I think it's more complete than this one.
>>
> sorry for didn't saw the patch before. But I think the patch I provide more simpler and also complete for fix this problem
>
>
>
sorry for skip this patch. Thx！
prev parent reply other threads:[~2019-02-17 3:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-16 0:58 [PATCH net-next] ip_tunnel: Fix DST_METADATA dst_entry handle in tnl_update_pmtu wenxu
2019-02-16 16:34 ` Alexei Starovoitov
2019-02-17 3:35 ` wenxu
2019-02-17 3:45 ` wenxu [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3c34b930-446f-a7de-bf54-5ee19b5bbd93@ucloud.cn \
--to=wenxu@ucloud.cn \
--cc=alexei.starovoitov@gmail.com \
--cc=davem@davemloft.net \
--cc=lkp@01.org \
--cc=netdev@vger.kernel.org \
--cc=rong.a.chen@intel.com \
--cc=sfr@canb.auug.org.au \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox