[linux-cifs-client] Re: DFS progress

[Steve French]

Oops is caused at the line in security/keys/request_key.c in
call_sbin_request_key:
      sskey = tsk->user->session_keyring->serial;
because session_keyring is null.

On Sun, May 18, 2008 at 8:21 PM, Steve French <smfrench at gmail.com> wrote:
> With the attached path (which only fixes the UnixQueryPathInfo case),
> am oopsing in the upcall on samba localhost

> BUG: unable to handle kernel NULL pointer dereference at 00000004
> IP: [<c02b3c8c>] call_sbin_request_key+0x148/0x220
> *pde = 00000000
> Oops: 0000 [#1] SMP
> Modules linked in: cifs
>
> Pid: 6236, comm: bash Not tainted (2.6.26-rc2-00052-gd0a9c07-dirty #4)
> EIP: 0060:[<c02b3c8c>] EFLAGS: 00010246 CPU: 0
> EIP is at call_sbin_request_key+0x148/0x220
> EAX: 00000000 EBX: 00000000 ECX: fffffffb EDX: deb99bc6
> ESI: f675a5d0 EDI: deb99ca0 EBP: deb99d2c ESP: deb99c84
>  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> Process bash (pid: 6236, ti=deb98000 task=f675a5d0 task.ti=deb98000)
> Stack: c0635239 f7befd08 deb87580 deb87380 deb80030 deb99ca8 deb87588 deb90030
>       c04e7427 deb99cd8 00000000 deb99ccc c02b0c36 f6c3a800 deb87ac4 00000000
>       00000000 f6c3a800 deb99cec c02b0c7f 00000000 00000000 7165725f 3730372e
> Call Trace:
>  [<c04e7427>] ? mutex_lock+0xe/0x1e
>  [<c02b0c36>] ? __key_instantiate_and_link+0x8b/0xa5
>  [<c02b0c7f>] ? key_instantiate_and_link+0x2f/0x49
>  [<c02b0030>] ? mqueue_poll_file+0x1d/0x56
>  [<c02b3b44>] ? call_sbin_request_key+0x0/0x220
>  [<c02b3a27>] ? request_key_and_link+0x1e3/0x231
>  [<c02b3d8f>] ? request_key+0x2b/0x58
>  [<f8d38bc7>] ? dns_resolve_server_name_to_ip+0x1f6/0x217 [cifs]
>  [<f8d38eff>] ? cifs_dfs_follow_mountpoint+0x2bc/0x631 [cifs]
>  [<c01673ac>] ? do_lookup+0x4f/0x140
>  [<c0173bea>] ? mnt_drop_write+0x1d/0xb7
>  [<c0168b02>] ? __link_path_walk+0x81c/0xb0b
>  [<c011f9a2>] ? printk+0x15/0x17
>  [<c0168e3d>] ? path_walk+0x4c/0x9b
>  [<c01690dc>] ? do_path_lookup+0x11f/0x13a
>  [<c01698fa>] ? __user_walk_fd+0x2f/0x48
>  [<c0163e3d>] ? vfs_stat_fd+0x19/0x40
>  [<c0163f13>] ? vfs_stat+0x11/0x13
>  [<c0163f29>] ? sys_stat64+0x14/0x28
>  [<c01036c9>] ? sysenter_past_esp+0x6a/0x91
>  =======================
> Code: ff ff 57 e8 6a 6c 01 00 8b 86 ac 02 00 00 83 c4 0c 83 b8 a0 01
> 00 00 00 74 08 8b 80 a0 01 00 00 eb 09 8b 86 e4 01 00 00 8b 40 24 <8b>
> 40 04 8d 5d 80 50 68 96 5b 64 c0 53 e8 35 6c 01 00 8b 85 58
> EIP: [<c02b3c8c>] call_sbin_request_key+0x148/0x220 SS:ESP 0068:deb99c84
> ---[ end trace 2cb388b698ff26eb ]---



-- 
Thanks,

Steve