Bug#340953: marked as done (linux-2.6: oops when asking ipv6 route when no public address?)

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Your message dated Fri, 3 Aug 2007 17:12:52 +0200
with message-id <20070803151252.GA26596@stro.at>
and subject line linux-2.6: oops when asking ipv6 route when no public address?
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--- Begin Message ---

• To: submit@bugs.debian.org
• Subject: linux-2.6: oops when asking ipv6 route when no public address?
• From: Kurt Roeckx <kurt@roeckx.be>
• Date: Sun, 27 Nov 2005 11:45:45 +0100
• Message-id: <20051127104544.GA24456@roeckx.be>

Package: linux-image-2.6.12-1-amd64-k8
Version: 2.6.12-10

Hi,

I do have the ipv6 module loaded, have a (default) link local
address assigned, but don't have any global ipv6 addresses.
This is basicly just loading the ipv6 module and doing nothing
else.

When I did the following command:
ip route get 2001:14b0:202:1::a7

I got an oops:
Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
<ffffffff881a7d6e>{:ipv6:ipv6_get_saddr+14}
PGD 6472f067 PUD 2e201067 PMD 0
Oops: 0000 [1]
CPU 0
Modules linked in: md5 ipv6 parport_pc parport floppy evdev pcspkr i2c_amd756 hw_random i2c_amd8111 i2c_core amd74xx tpm_nsc tpm_atmel tpm shpchp pci_hotplug ohci_hcd tg3 ext2 rtc psmouse ide_generic ide_disk ide_cd cdrom ide_core ext3 jbd
mbcache sd_mod sata_sil libata scsi_mod raid0 md unix fbcon tileblit font bitblit vesafb cfbcopyarea cfbimgblt cfbfillrect softcursor
Pid: 13701, comm: ip Not tainted 2.6.12-1-amd64-k8
RIP: 0010:[<ffffffff881a7d6e>] <ffffffff881a7d6e>{:ipv6:ipv6_get_saddr+14}
RSP: 0018:ffff81006f839a10  EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff81006f839a48 RCX: 0000000000000000
RDX: ffff81006f839a48 RSI: ffff81006f839ac0 RDI: ffffffff881dae20
RBP: ffff810006514680 R08: 0000000000000000 R09: 0000000000000018
R10: 0000000000000000 R11: ffff81006f839ac0 R12: ffffffff881dae20
R13: ffff8100309d20b8 R14: 0000000000000000 R15: ffff81006f839ac0
FS:  00002aaaaaf15d40(0000) GS:ffffffff8040f940(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 000000004e43b000 CR4: 00000000000006e0
Process ip (pid: 13701, threadinfo ffff81006f838000, task ffff81007e6569e0)
Stack: ffffffff881aa538 ffff810006514680 0000000000000296 0000000000000000
       ffffffff881abc48 0000000000000246 ffff81006f839ad0 ffff81007e6569e0
       0000000300000282 ffff810006514680
Call Trace:<ffffffff881aa538>{:ipv6:rt6_fill_node+712} <ffffffff881abc48>{:ipv6:ip6_route_output+1256}
       <ffffffff881abe01>{:ipv6:inet6_rtm_getroute+353} <ffffffff80269b7f>{rtnetlink_rcv+623}
       <ffffffff8027a6c2>{netlink_data_ready+18} <ffffffff802788ce>{netlink_sendskb+46}
       <ffffffff8027a447>{netlink_sendmsg+759} <ffffffff8025877b>{sock_sendmsg+283}
       <ffffffff80144e00>{autoremove_wake_function+0} <ffffffff80144e00>{autoremove_wake_function+0}
       <ffffffff80157ac8>{buffered_rmqueue+536} <ffffffff80157bcc>{__alloc_pages+188}
       <ffffffff80257d25>{move_addr_to_kernel+37} <ffffffff802593aa>{sys_sendmsg+586}
       <ffffffff8011efd3>{do_page_fault+1171} <ffffffff801651e2>{do_brk+498}
       <ffffffff8010e67a>{system_call+126}

Code: 48 8b 00 48 89 c7 e9 b7 fd ff ff 66 66 66 90 66 66 90 48 81
RIP <ffffffff881a7d6e>{:ipv6:ipv6_get_saddr+14} RSP <ffff81006f839a10>
CR2: 0000000000000000

I assume it's trying to get the source address, and there
isn't any that can reach that host, because I don't have
any global ipv6 address assigned.


Kurt

--- End Message ---

--- Begin Message ---

• To: 340953-done@bugs.debian.org
• Subject: linux-2.6: oops when asking ipv6 route when no public address?
• From: maximilian attems <max@stro.at>
• Date: Fri, 3 Aug 2007 17:12:52 +0200
• Message-id: <20070803151252.GA26596@stro.at>

Package: linux-2.6
Version: 2.6.22-1

 ip route get 2001:14b0:202:1::a7
 unreachable 2001:14b0:202:1::a7 dev lo  table unspec  proto none  src ::1 metric -1  error -101 advmss 1404 hoplimit 255


and no oops, have disabled ipv6 on our 2.6.18 kernels
thus no easy test atm, but i guess this should have been already
fixed earlier.


-- 
maks

--- End Message ---