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Luis R. Rodriguez 2784fe915c cfg80211: fix null pointer dereference with a custom regulatory request 
Once we moved the core regulatory request to the queue and let
the scheduler process it last_request will have been left NULL
until the schedular decides to process the first request. When
this happens and we are loading a driver with a custom regulatory
request like all Atheros drivers we end up with a NULL pointer
dereference. We fix this by checking if the request was a
custom one.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
IP: [<ffffffffa016de87>] freq_reg_info_regd.clone.2+0x27/0x130 [cfg80211]
PGD 71f91067 PUD 712b2067 PMD 0
Oops: 0000 [#1] PREEMPT SMP
last sysfs file: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/firmware/2-1/loading
CPU 0
Modules linked in: ath9k_htc(+) ath9k_common ath9k_hw ath <etc>
Pid: 3094, comm: insmod Tainted: G        W   2.6.37-rc5-wl #16 INVALID/28427ZQ
RIP: 0010:[<ffffffffa016de87>]  [<ffffffffa016de87>] freq_reg_info_regd.clone.2+0x27/0x130 [cfg80211]
RSP: 0018:ffff88007045db78  EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffffa047d9a0 RCX: ffff88007045dbd0
RDX: 0000000000004e20 RSI: 000000000024cde0 RDI: ffff8800700483e0
RBP: ffff88007045db98 R08: ffffffffa02f5b40 R09: 0000000000000001
R10: 000000000000000e R11: 0000000000000001 R12: 0000000000000000
R13: ffff88007004e3b0 R14: 0000000000000000 R15: ffff880070048340
FS:  00007f635a707700(0000) GS:ffff880077400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000004 CR3: 00000000708a9000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process insmod (pid: 3094, threadinfo ffff88007045c000, task ffff8800713e3ec0)
Stack:
 ffffffffa047d9a0 0000000000000000 ffff88007004e3b0 0000000000000000
 ffff88007045dc08 ffffffffa016e147 000000007045dc08 0000000000000002
 ffff8800700483e0 ffffffffa02f5b40 ffff88007045dbd8 0000000000000000
Call Trace:
 [<ffffffffa016e147>] wiphy_apply_custom_regulatory+0x137/0x1d0 [cfg80211]
 [<ffffffffa047a690>] ? ath9k_reg_notifier+0x0/0x50 [ath9k_htc]
 [<ffffffffa02f47f7>] ath_regd_init+0x347/0x430 [ath]
 [<ffffffffa047b1f5>] ath9k_htc_probe_device+0x6c5/0x960 [ath9k_htc]
 [<ffffffffa0472a2c>] ath9k_htc_hw_init+0xc/0x30 [ath9k_htc]
 [<ffffffffa04747e6>] ath9k_hif_usb_probe+0x216/0x3b0 [ath9k_htc]
 [<ffffffffa03bb6bc>] usb_probe_interface+0x10c/0x210 [usbcore]
 [<ffffffff812aec26>] driver_probe_device+0x96/0x1c0
 [<ffffffff812aedf3>] __driver_attach+0xa3/0xb0
 [<ffffffff812aed50>] ? __driver_attach+0x0/0xb0
 [<ffffffff812adaae>] bus_for_each_dev+0x5e/0x90
 [<ffffffff812ae8c9>] driver_attach+0x19/0x20
 [<ffffffff812ae438>] bus_add_driver+0x168/0x320
 [<ffffffff812af071>] driver_register+0x71/0x140
 [<ffffffff811fc4a8>] ? __raw_spin_lock_init+0x38/0x70
 [<ffffffffa03ba39c>] usb_register_driver+0xdc/0x190 [usbcore]
 [<ffffffffa03a2000>] ? ath9k_htc_init+0x0/0x4f [ath9k_htc]
 [<ffffffffa047499e>] ath9k_hif_usb_init+0x1e/0x20 [ath9k_htc]
 [<ffffffffa03a202b>] ath9k_htc_init+0x2b/0x4f [ath9k_htc]
 [<ffffffff8100212f>] do_one_initcall+0x3f/0x180
 [<ffffffff8109ef5b>] sys_init_module+0xbb/0x200
 [<ffffffff8100bf52>] system_call_fastpath+0x16/0x1b
Code: <etc, who cares>
RIP  [<ffffffffa016de87>] freq_reg_info_regd.clone.2+0x27/0x130 [cfg80211]
 RSP <ffff88007045db78>
CR2: 0000000000000004
---[ end trace 79e4193601c8b713 ]---

Reported-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-12-16 15:22:31 -05:00
..
9p net/9p: Return error on read with NULL buffer 2010-10-28 09:08:49 -05:00
802 net/802: add __rcu annotations 2010-10-25 13:09:44 -07:00
8021q vlan: rcu annotations 2010-10-25 13:09:43 -07:00
appletalk
atm Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2010-10-23 11:47:02 -07:00
ax25 Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-10-24 13:41:39 -07:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6 2010-12-15 16:33:28 -05:00
bridge bridge: Forward reserved group addresses if !STP 2010-10-21 04:25:48 -07:00
caif Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-10-06 19:39:31 -07:00
can can-raw: add msg_flags to distinguish local traffic 2010-10-21 04:27:03 -07:00
ceph ceph: fix num_pages_free accounting in pagelist 2010-10-20 15:38:23 -07:00
core pktgen: Limit how much data we copy onto the stack. 2010-10-28 11:47:53 -07:00
dcb
dccp dccp ccid-2: Stop polling 2010-10-28 10:27:01 -07:00
decnet net dst: use a percpu_counter to track entries 2010-10-11 13:06:53 -07:00
dns_resolver
dsa
econet net: return operator cleanup 2010-09-23 14:33:39 -07:00
ethernet net: return operator cleanup 2010-09-23 14:33:39 -07:00
ieee802154
ipv4 ip_gre: fix fallback tunnel setup 2010-10-30 16:21:28 -07:00
ipv6 ipv6/udp: report SndbufErrors and RcvbufErrors 2010-10-30 16:17:23 -07:00
ipx BKL: introduce CONFIG_BKL. 2010-10-21 15:44:13 +02:00
irda Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-10-24 13:41:39 -07:00
iucv [S390] cleanup lowcore access from external interrupts 2010-10-25 16:10:19 +02:00
key net: return operator cleanup 2010-09-23 14:33:39 -07:00
l2tp l2tp: static functions should not be exported 2010-10-24 22:26:41 -07:00
lapb
llc net/llc: storing negative error codes in unsigned short 2010-09-16 22:38:23 -07:00
mac80211 nl80211: Add notification for dropped Deauth/Disassoc 2010-12-16 15:22:30 -05:00
netfilter netfilter: xt_socket: Make tproto signed in socket_mt6_v1(). 2010-10-28 12:59:53 -07:00
netlabel
netlink netlink: fix netlink_change_ngroups() 2010-10-24 16:25:39 -07:00
netrom
packet net: simplify flags for tx timestamping 2010-08-19 00:08:30 -07:00
phonet phonet: remove the unused variable pn 2010-10-20 01:55:54 -07:00
rds RDS: Let rds_message_alloc_sgs() return NULL 2010-10-30 16:34:18 -07:00
rfkill rfkill: remove dead code 2010-11-15 13:24:06 -05:00
rose Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-09-27 01:03:03 -07:00
rxrpc
sched Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2010-10-23 11:47:02 -07:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2010-10-23 11:47:02 -07:00
sunrpc convert get_sb_single() users 2010-10-29 04:16:28 -04:00
tipc Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-10-21 08:43:05 -07:00
unix fs: allow for more than 2^31 files 2010-10-26 16:52:15 -07:00
wanrouter
wimax
wireless cfg80211: fix null pointer dereference with a custom regulatory request 2010-12-16 15:22:31 -05:00
x25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2010-10-23 11:47:02 -07:00
xfrm xfrm: make xfrm_bundle_ok local 2010-10-21 03:09:46 -07:00
compat.c net: Limit socket I/O iovec total length to INT_MAX. 2010-10-28 11:47:52 -07:00
Kconfig ceph: factor out libceph from Ceph file system 2010-10-20 15:37:28 -07:00
Makefile ceph: factor out libceph from Ceph file system 2010-10-20 15:37:28 -07:00
nonet.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
socket.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-10-30 18:42:58 -07:00
sysctl_net.c
TUNABLE