Re: [BUG]NULL pointer dereference in ipv6_get_saddr()

["linux-os \(Dick Johnson\)" <linux-os@analogic.com>]

On Tue, 18 Oct 2005, Yan Zheng wrote:

> When I use command "ip -f inet6 route get fec0::1", kernel Oops occurs.
> I found it's due to ip_route_output return address of ip6_null_entry, ip6_null_entry.rt6i_idev is NULL.
>
>
> ====================================================================================================
> Unable to handle kernel NULL pointer dereference at virtual address 00000000
> printing eip:
> e0fc7991
> *pde = 1759f067
> Oops: 0000 [#1]
> Modules linked in: vmnet(U) parport_pc parport vmmon(U) iptable_nat ppp_synctty ppp_async crc_ccitt ppp_generic slhc fglrx(U) kqemu(U) autofs4 ip_conntrack_ftp ipt_REJECT ipt_state ip_conntrack iptable_filter ip_tables reiserfs dm_mod video button battery ac ipv6 uhci_hcd ehci_hcd i2c_viapro i2c_core snd_via82xx gameport snd_ac97_codec snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore via_rhine mii ext3 jbd
> CPU:    0
> EIP:    0060:[<e0fc7991>]    Tainted: P      VLI
> EFLAGS: 00010282   (2.6.13-1.1526_FC4)
> EIP is at ipv6_get_saddr+0xd/0x17 [ipv6]
> eax: 00000000   ebx: 00000000   ecx: d5786c2c   edx: d5786c80
> esi: c38d1ee0   edi: e1005b20   ebp: d187f088   esp: d5786bec
> ds: 007b   es: 007b   ss: 0068
> Process ip (pid: 11718, threadinfo=d5786000 task=c23a9000)
> Stack: badc0ded d5786c2c e0fd22a1 d5786c80 00000000 00000286 d5786c80 d5786c80
>       00000232 d5786c78 d5786c78 e0fd04cb df7458d0 00000000 dfffb920 dfffb920
>       00000030 d5786c90 d5786c78 d5786c80 00000003 00002dc6 ce7e2638 c7b5f400
> Call Trace:
> [<e0fd22a1>] rt6_fill_node+0x428/0x4d5 [ipv6]
> [<e0fd04cb>] ip6_route_output+0xf1/0x2d4 [ipv6]
> [<e0fd2675>] inet6_rtm_getroute+0x125/0x193 [ipv6]
> [<e0fd2550>] inet6_rtm_getroute+0x0/0x193 [ipv6]
> [<c038fe53>] rtnetlink_rcv+0x21b/0x3a4
> [<c03a26b7>] netlink_data_ready+0x12/0x54
> [<c03a1c05>] netlink_sendskb+0x19/0x34
> [<c03a23cc>] netlink_sendmsg+0x26d/0x318
> [<c03781e4>] sock_sendmsg+0xe4/0xff
> [<c01519c2>] autoremove_wake_function+0x0/0x37
> [<c018ca56>] anon_vma_prepare+0x466/0x4ff
> [<c01519c2>] autoremove_wake_function+0x0/0x37
> [<c025e0c4>] copy_from_user+0x4c/0x88
> [<c03799dc>] sys_sendmsg+0x11e/0x213
> [<c0165659>] audit_sockaddr+0x39/0x78
> [<c0185f55>] __handle_mm_fault+0x303/0x4b0
> [<c011e401>] do_page_fault+0x260/0x5cd
> [<c01876f9>] vma_link+0x10d/0x53f
> [<c0379f18>] sys_socketcall+0x270/0x292
> [<c0109b52>] do_syscall_trace+0xef/0x123
> [<c0104465>] syscall_call+0x7/0xb
> Code: f3 e8 ff ff e9 8e fe ff ff c7 44 24 04 00 00 00 00 c7 44 24 08 ff ff ff ff e9 94 fe ff ff 53 31 db 85 c0 74 08 8b 80 88 00 00 00 <8b> 18 89 d8 5b e9 a1 fd ff ff 57 56 8b 88 f0 00 00 00 be 9d ff
>

Same with linux-2.6.14.4

Unable to handle kernel NULL pointer dereference at virtual address 00000000
  printing eip:
f0928630
*pde = 00000000
Oops: 0000 [#1]
PREEMPT SMP
Modules linked in: nls_iso8859_1 vfat floppy snd_pcm_oss snd_mixer_oss snd_intel8x0 snd_ac97_codec snd_pcm snd_timer snd snd_page_alloc soundcore parport_pc lp parport nfsd exportfs lockd sunrpc e100 mii ipt_REJECT ipt_state ip_conntrack iptable_filter ip_tables microcode nls_cp437 msdos fat dm_mod uhci_hcd ehci_hcd video container button battery ac rtc ipv6 ext3 jbd ata_piix libata aic7xxx scsi_transport_spi sd_mod scsi_mod
CPU:    0
EIP:    0060:[<f0928630>]    Not tainted VLI
EFLAGS: 00010286   (2.6.13.4)
EIP is at ipv6_get_saddr+0x10/0x20 [ipv6]
eax: 00000000   ebx: dab29bbc   ecx: 00000000   edx: f095b760
esi: d8e69b80   edi: e3b49078   ebp: f095b760   esp: dab29ba0
ds: 007b   es: 007b   ss: 0068
Process ip (pid: 27746, threadinfo=dab28000 task=ee2f2020)
Stack: f093115b f095b760 dab29c34 dab29bbc dab29c34 dab29bb8 00000282 dab29c34
        d8e69b80 00000000 d8e69b80 f092efc4 f095b838 dab29c34 dab29c44 00000014
        dab29c44 dab29c34 00000003 d8e69b80 ffffffa6 00000000 dab29c2c f0931635
Call Trace:
  [<f093115b>] rt6_fill_node+0x43b/0x560 [ipv6]
  [<f092efc4>] ip6_route_output+0x114/0x360 [ipv6]
  [<f0931635>] inet6_rtm_getroute+0x135/0x1c0 [ipv6]
  [<c02e83a7>] rtnetlink_rcv+0x307/0x3d0
  [<c02f587b>] netlink_data_ready+0x6b/0x70
  [<c02f4c12>] netlink_sendskb+0x32/0x60
  [<c02f54ba>] netlink_sendmsg+0x20a/0x340
  [<c02f579c>] netlink_recvmsg+0x1ac/0x220
  [<c02d3a05>] sock_sendmsg+0x115/0x120
  [<c018477c>] update_atime+0x9c/0xd0
  [<c02d3a05>] sock_sendmsg+0x115/0x120
  [<c01e25ac>] copy_from_user+0x6c/0xb0
  [<c0135f10>] autoremove_wake_function+0x0/0x60
  [<c02d578f>] sys_sendmsg+0x18f/0x1f0
  [<c02d3408>] move_addr_to_kernel+0x48/0x70
  [<c0157ccd>] __handle_mm_fault+0x11d/0x1a0
  [<c015ad3e>] do_brk+0x22e/0x2e0
  [<c01e25ac>] copy_from_user+0x6c/0xb0
  [<c02d5c52>] sys_socketcall+0x262/0x280
  [<c010314b>] sysenter_past_esp+0x54/0x75
Code: c5 fe ff ff 89 14 24 e8 3f f3 ff ff eb ce 8d b6 00 00 00 00 8d bc 27 00 00 00 00 8b 54 24 04 31 c0 85 d2 74 08 8b 82 88 00 00 00 <8b> 00 89 44 24 04 e9 75 fd ff ff 90 8d 74 26 00 55 b8 34 af 95



Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5589.46 BogoMips).
Warning : 98.36% of all statistics are fiction.
.

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