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SubjectRe: 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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