netdev - Re: OOPS, ip -f inet6 route get fec0::1, linux-2.6.26, ip6_route_output, rt6_fill

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Date:	Fri, 8 Aug 2008 00:37:48 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	John Gumb <john.gumb@...dberg.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: OOPS, ip -f inet6 route get fec0::1, linux-2.6.26,
	ip6_route_output, rt6_fill_node+0x175

On Thu, Aug 07, 2008 at 07:00:56PM +0200, John Gumb wrote:
> Scenario: no ipv6 default route set.

> # ip -f inet6 route get fec0::1
> 
> BUG: unable to handle kernel NULL pointer dereference at 00000000
> IP: [<c0369b85>] rt6_fill_node+0x175/0x3b0
> EIP is at rt6_fill_node+0x175/0x3b0
>  ip6_route_output+0x50/0xa0
>  ip6_pol_route_output+0x0/0x20
>  inet6_rtm_getroute+0x16e/0x200
>  inet6_rtm_getroute+0x0/0x200
>  rtnetlink_rcv_msg+0x1b9/0x1f0
>  rtnetlink_rcv_msg+0x0/0x1f0
>  netlink_rcv_skb+0x8d/0xb0
>  rtnetlink_rcv+0x17/0x20
>  netlink_unicast+0x23d/0x270
>  memcpy_fromiovec+0x4a/0x70
>  netlink_sendmsg+0x1c1/0x290
>  sock_sendmsg+0xc5/0xf0
>  autoremove_wake_function+0x0/0x50
>  autoremove_wake_function+0x0/0x50
>  sock_sendmsg+0xc5/0xf0
>  copy_from_user+0x37/0x70
>  verify_iovec+0x2c/0x90
>  sys_sendmsg+0x10a/0x220

0xffffffff80424dd3 is in rt6_fill_node (net/ipv6/route.c:2191).
2186                    } else
2187    #endif
2188                            NLA_PUT_U32(skb, RTA_IIF, iif);
2189            } else if (dst) {
2190                    struct in6_addr saddr_buf;
2191      ====>         if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev,
					       ^^^^^^^^^^^^^^^^^^^^^^^^
					       		NULL

2192                                           dst, 0, &saddr_buf) == 0)
2193                            NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
2194            }

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