During initialization we would not have received any beacons
so skip processing reg beacon hints, also adds a check to
reg_is_world_roaming() for last_request before accessing its
fields.
This should fix this:
BUG: unable to handle kernel NULL pointer dereference at
IP: [<
e0171332>] wiphy_update_regulatory+0x20f/0x295
*pdpt =
0000000008bf1001 *pde =
0000000000000000
Oops: 0000 [#1]
last sysfs file: /sys/class/backlight/eeepc/brightness
Modules linked in: ath5k(+) mac80211 led_class cfg80211
go_bit cfbcopyarea cfbimgblt cfbfillrect ipv6
ydev usual_tables(P) snd_hda_codec_realtek snd_hda_intel
nd_hwdep uhci_hcd snd_pcm_oss snd_mixer_oss i2c_i801
e serio_raw i2c_core pcspkr atl2 snd_pcm intel_agp
re agpgart eeepc_laptop snd_page_alloc ac video backlight
rfkill button processor evdev thermal fan ata_generic
Pid: 2909, comm: modprobe Tainted: Pc #112) 701
EIP: 0060:[<
e0171332>] EFLAGS:
00010246 CPU: 0
EIP is at wiphy_update_regulatory+0x20f/0x295 [cfg80211]
EAX:
00000000 EBX:
c5da0000 ECX:
00000000 EDX:
c5da0060
ESI:
0000001a EDI:
c5da0060 EBP:
df3bdd70 ESP:
df3bdd40
DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Process modprobe (pid: 2909, ti=
df3bc000 task=
c5d030000)
Stack:
df3bdd90 c5da0060 c04277e0 00000001 00000044 c04277e402
00000002 c5da0000 0000001a c5da0060 df3bdda8 e01706a2 02
00000282 000080d0 00000068 c5d53500 00000080 0000028240
Call Trace:
[<
e01706a2>] ? wiphy_register+0x122/0x1b7 [cfg80211]
[<
e0328e02>] ? ieee80211_register_hw+0xd8/0x346
[<
e06a7c9f>] ? ath5k_hw_set_bssid_mask+0x71/0x78 [ath5k]
[<
e06b0c52>] ? ath5k_pci_probe+0xa5c/0xd0a [ath5k]
[<
c01a6037>] ? sysfs_find_dirent+0x16/0x27
[<
c01fec95>] ? local_pci_probe+0xe/0x10
[<
c01ff526>] ? pci_device_probe+0x48/0x66
[<
c024c9fd>] ? driver_probe_device+0x7f/0xf2
[<
c024cab3>] ? __driver_attach+0x43/0x5f
[<
c024c0af>] ? bus_for_each_dev+0x39/0x5a
[<
c024c8d0>] ? driver_attach+0x14/0x16
[<
c024ca70>] ? __driver_attach+0x0/0x5f
[<
c024c5b3>] ? bus_add_driver+0xd7/0x1e7
[<
c024ccb9>] ? driver_register+0x7b/0xd7
[<
c01ff827>] ? __pci_register_driver+0x32/0x85
[<
e00a8018>] ? init_ath5k_pci+0x18/0x30 [ath5k]
[<
c0101131>] ? _stext+0x49/0x10b
[<
e00a8000>] ? init_ath5k_pci+0x0/0x30 [ath5k]
[<
c012f452>] ? __blocking_notifier_call_chain+0x40/0x4c
[<
c013a714>] ? sys_init_module+0x87/0x18b
[<
c0102804>] ? sysenter_do_call+0x12/0x22
Code: b8 da 17 e0 83 c0 04 e8 92 f9 ff ff 84 c0 75 2a 8b
85 c0 74 0c 83 c0 04 e8 7c f9 ff ff 84 c0 75 14 a1 bc da
4 03 74 66 8b 4d d4 80 79 08 00 74 5d a1 e0 d2 17 e0 48
EIP: [<
e0171332>] wiphy_update_regulatory+0x20f/0x295
SP 0068:
df3bdd40
CR2:
0000000000000004
---[ end trace
830f2dd2a95fd1a8 ]---
This issue is hard to reproduce, but it was noticed and discussed on
this thread:
http://marc.info/?t=
123938022700005&r=1&w=2
Cc: stable@kernel.org
Reported-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>