diff options
| author | Luis R. Rodriguez <lrodriguez@atheros.com> | 2009-05-02 00:34:15 -0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-05-04 16:22:13 -0400 |
| commit | b1ed8ddd21a2d7acf8efbb60a112ea5c9f914159 (patch) | |
| tree | 3e39b43a2b4a8454e8e718153fd51fabff4a9da1 /virt | |
| parent | ac46d48e00349c63650b3cc6f9460fcc183da6a6 (diff) | |
cfg80211: fix bug while trying to process beacon hints on init
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>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions