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linux/drivers/net/usb
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Bjørn Mork d9b8706843 net: qmi_wwan: fix Oops while disconnecting 
usbnet_disconnect() will set intfdata to NULL before calling
the minidriver unbind function.  The cdc_wdm subdriver cannot
know that it is disconnecting until the qmi_wwan unbind
function has called its disconnect function.  This means that
we must be able to support the cdc_wdm subdriver operating
normally while usbnet_disconnect() is running, and in
particular that intfdata may be NULL.

The only place this matters is in qmi_wwan_cdc_wdm_manage_power
which is called from cdc_wdm.  Simply testing for NULL
intfdata there is sufficient to allow it to continue working
at all times.

Fixes this Oops where a cdc-wdm device was closed while the
USB device was disconnecting, causing wdm_release to call
qmi_wwan_cdc_wdm_manage_power after intfdata was set to
NULL by usbnet_disconnect:

[41819.087460] BUG: unable to handle kernel NULL pointer dereference at 00000080
[41819.087815] IP: [<f8640458>] qmi_wwan_manage_power+0x68/0x90 [qmi_wwan]
[41819.088028] *pdpt = 000000000314f001 *pde = 0000000000000000
[41819.088028] Oops: 0002 [#1] SMP
[41819.088028] Modules linked in: qmi_wwan option usb_wwan usbserial usbnet
cdc_wdm nls_iso8859_1 nls_cp437 vfat fat usb_storage bnep rfcomm bluetooth
parport_pc ppdev binfmt_misc iptable_nat nf_nat nf_conntrack_ipv4
nf_conntrack nf_defrag_ipv4 iptable_mangle iptable_filter ip_tables
x_tables dm_crypt uvcvideo snd_hda_codec_realtek snd_hda_intel
videobuf2_core snd_hda_codec joydev videodev videobuf2_vmalloc
hid_multitouch snd_hwdep arc4 videobuf2_memops snd_pcm snd_seq_midi
snd_rawmidi snd_seq_midi_event ath9k mac80211 snd_seq ath9k_common ath9k_hw
ath snd_timer snd_seq_device sparse_keymap dm_multipath scsi_dh coretemp
mac_hid snd soundcore cfg80211 snd_page_alloc psmouse serio_raw microcode
lp parport dm_mirror dm_region_hash dm_log usbhid hid i915 drm_kms_helper
drm r8169 i2c_algo_bit wmi video [last unloaded: qmi_wwan]
[41819.088028]
[41819.088028] Pid: 23292, comm: qmicli Not tainted 3.4.0-5-generic #11-Ubuntu GIGABYTE T1005/T1005
[41819.088028] EIP: 0060:[<f8640458>] EFLAGS: 00010246 CPU: 1
[41819.088028] EIP is at qmi_wwan_manage_power+0x68/0x90 [qmi_wwan]
[41819.088028] EAX: 00000000 EBX: 00000000 ECX: 000000c3 EDX: 00000000
[41819.088028] ESI: c3b27658 EDI: 00000000 EBP: c298bea4 ESP: c298be98
[41819.088028]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[41819.088028] CR0: 8005003b CR2: 00000080 CR3: 3605e000 CR4: 000007f0
[41819.088028] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[41819.088028] DR6: ffff0ff0 DR7: 00000400
[41819.088028] Process qmicli (pid: 23292, ti=c298a000 task=f343b280 task.ti=c298a000)
[41819.088028] Stack:
[41819.088028]  00000000 c3b27658 e2a80d00 c298beb0 f864051a c3b27600 c298bec0 f9027099
[41819.088028]  c2fd6000 00000008 c298bef0 c1147f96 00000001 00000000 00000000 f4e54790
[41819.088028]  ecf43a00 ecf43a00 c2fd6008 c2fd6000 ebbd7600 ffffffb9 c298bf08 c1144474
[41819.088028] Call Trace:
[41819.088028]  [<f864051a>] qmi_wwan_cdc_wdm_manage_power+0x1a/0x20 [qmi_wwan]
[41819.088028]  [<f9027099>] wdm_release+0x69/0x70 [cdc_wdm]
[41819.088028]  [<c1147f96>] fput+0xe6/0x210
[41819.088028]  [<c1144474>] filp_close+0x54/0x80
[41819.088028]  [<c1046a65>] put_files_struct+0x75/0xc0
[41819.088028]  [<c1046b56>] exit_files+0x46/0x60
[41819.088028]  [<c1046f81>] do_exit+0x141/0x780
[41819.088028]  [<c107248f>] ? wake_up_state+0xf/0x20
[41819.088028]  [<c1053f48>] ? signal_wake_up+0x28/0x40
[41819.088028]  [<c1054f3b>] ? zap_other_threads+0x6b/0x80
[41819.088028]  [<c1047864>] do_group_exit+0x34/0xa0
[41819.088028]  [<c10478e8>] sys_exit_group+0x18/0x20
[41819.088028]  [<c15bb7df>] sysenter_do_call+0x12/0x28
[41819.088028] Code: 04 83 e7 01 c1 e7 03 0f b6 42 18 83 e0 f7 09 f8 88 42
18 8b 43 04 e8 48 9a dd c8 89 f0 8b 5d f4 8b 75 f8 8b 7d fc 89 ec 5d c3 90
<f0> ff 88 80 00 00 00 0f 94 c0 84 c0 75 b7 31 f6 8b 5d f4 89 f0
[41819.088028] EIP: [<f8640458>] qmi_wwan_manage_power+0x68/0x90 [qmi_wwan] SS:ESP 0068:c298be98
[41819.088028] CR2: 0000000000000080
[41819.149492] ---[ end trace 0944479ff8257f55 ]---

Reported-by: Marius Bjørnstad Kotsbak <marius.kotsbak@gmail.com>
Cc: <stable@vger.kernel.org> # v3.4
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-06-28 16:53:28 -07:00
..
asix.c asix: allow full size 8021Q frames to be received 2012-05-29 17:30:07 -04:00
catc.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
cdc_eem.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
cdc_ether.c USB 3.5-rc1 pull request 2012-05-22 15:50:46 -07:00
cdc_ncm.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
cdc_subset.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
cdc-phonet.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
cx82310_eth.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
dm9601.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
gl620a.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
hso.c TTY pull request for 3.5-rc1 2012-05-22 16:12:24 -07:00
int51x1.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
ipheth.c ipheth: add support for iPad 2012-06-25 16:20:41 -07:00
kalmia.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
kaweth.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
Kconfig net: qmi_wwan: fix build error due to cdc-wdm dependecy 2012-03-19 18:17:18 -04:00
lg-vl600.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
Makefile net: usb: qmi_wwan: New driver for Huawei QMI based WWAN devices 2012-03-09 13:09:17 -08:00
mcs7830.c mcs7830: Implement link state detection 2012-06-02 17:09:08 -04:00
net1080.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
pegasus.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
pegasus.h usb: pegasus: fixed coding style issues 2010-06-30 10:26:16 -07:00
plusb.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
qmi_wwan.c net: qmi_wwan: fix Oops while disconnecting 2012-06-28 16:53:28 -07:00
rndis_host.c USB 3.5-rc1 pull request 2012-05-22 15:50:46 -07:00
rtl8150.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
sierra_net.c net: sierra_net: device IDs for Aircard 320U++ 2012-06-06 10:40:32 -07:00
smsc75xx.c USB 3.5-rc1 pull request 2012-05-22 15:50:46 -07:00
smsc75xx.h smsc75xx: replace 0xffff with PHY_INT_SRC_CLEAR_ALL 2012-05-07 23:43:56 -04:00
smsc95xx.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00
smsc95xx.h
usbnet.c usbnet: handle remote wakeup asap 2012-06-22 17:34:18 -07:00
zaurus.c USB: Disable hub-initiated LPM for comms devices. 2012-05-18 15:42:55 -07:00