Re: NULL pointer dereference when loading the gre module (3.10.0-rc4)

Steinar H. Gunderson
2013-06-07T17:52:42Z

On Fri, Jun 07, 2013 at 12:12:23PM -0400, Steven Rostedt wrote:
>> Ffffffffa0e76000 u ip_tunnel_init_net [ip_gre]
> What do you get if you do an objdump -Dr ip_gre.ko
>
> And then look for ipgre_init, and then subtract 0xb053 (45139) from its
> address. As that is: ffffffffa0e81055 - ffffffffa0e76002, then see if
> that object file has anything in that location.

pannekake:~> objdump -Dr /lib/modules/3.10.0-rc4/kernel/net/ipv4/ip_gre.ko | grep ipgre_init
0000000000000000 <ipgre_init_net>:
0: 8b 35 00 00 00 00 mov 0x0(%rip),%esi # 6 <ipgre_init_net+0x6>
13: e8 00 00 00 00 callq 18 <ipgre_init_net+0x18>

Ie., the symbol doesn't show up in the disassembly (for whatever reason).