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Date:	Wed, 30 Dec 2015 19:02:25 +0200
From:	Uri Mashiach <uri.mashiach@...pulab.co.il>
To:	Kalle Valo <kvalo@...eaurora.org>
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	igor.grinberg@...pulab.co.il
Subject: Re: [PATCH] wlcore/wl12xx: spi: fix NULL pointer dereference (Oops)

Hello Kalle Valo,

On 12/30/2015 05:15 PM, Kalle Valo wrote:
> Uri Mashiach <uri.mashiach@...pulab.co.il> writes:
>
>> Fix the below Oops when trying to modprobe wlcore_spi.
>> The oops occurs because the wl1271_power_{off,on}()
>> function doesn't check the power() function pointer.
>>
>> [   23.401447] Unable to handle kernel NULL pointer dereference at
>> virtual address 00000000
>> [   23.409954] pgd = c0004000
>> [   23.412922] [00000000] *pgd=00000000
>> [   23.416693] Internal error: Oops: 80000007 [#1] SMP ARM
>> [   23.422168] Modules linked in: wl12xx wlcore mac80211 cfg80211
>> musb_dsps musb_hdrc usbcore usb_common snd_soc_simple_card evdev joydev
>> omap_rng wlcore_spi snd_soc_tlv320aic23_i2c rng_core snd_soc_tlv320aic23
>> c_can_platform c_can can_dev snd_soc_davinci_mcasp snd_soc_edma
>> snd_soc_omap omap_wdt musb_am335x cpufreq_dt thermal_sys hwmon
>> [   23.453253] CPU: 0 PID: 36 Comm: kworker/0:2 Not tainted
>> 4.2.0-00002-g951efee-dirty #233
>> [   23.461720] Hardware name: Generic AM33XX (Flattened Device Tree)
>> [   23.468123] Workqueue: events request_firmware_work_func
>> [   23.473690] task: de32efc0 ti: de4ee000 task.ti: de4ee000
>> [   23.479341] PC is at 0x0
>> [   23.482112] LR is at wl12xx_set_power_on+0x28/0x124 [wlcore]
>> [   23.488074] pc : [<00000000>]    lr : [<bf2581f0>]    psr: 60000013
>> [   23.488074] sp : de4efe50  ip : 00000002  fp : 00000000
>> [   23.500162] r10: de7cdd00  r9 : dc848800  r8 : bf27af00
>> [   23.505663] r7 : bf27a1a8  r6 : dcbd8a80  r5 : dce0e2e0  r4 :
>> dce0d2e0
>> [   23.512536] r3 : 00000000  r2 : 00000000  r1 : 00000001  r0 :
>> dc848810
>> [   23.519412] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM
>> Segment kernel
>> [   23.527109] Control: 10c5387d  Table: 9cb78019  DAC: 00000015
>> [   23.533160] Process kworker/0:2 (pid: 36, stack limit = 0xde4ee218)
>> [   23.539760] Stack: (0xde4efe50 to 0xde4f0000)
>>
>> [...]
>>
>> [   23.665030] [<bf2581f0>] (wl12xx_set_power_on [wlcore]) from
>> [<bf25f7ac>] (wlcore_nvs_cb+0x118/0xa4c [wlcore])
>> [   23.675604] [<bf25f7ac>] (wlcore_nvs_cb [wlcore]) from [<c04387ec>]
>> (request_firmware_work_func+0x30/0x58)
>> [   23.685784] [<c04387ec>] (request_firmware_work_func) from
>> [<c0058e2c>] (process_one_work+0x1b4/0x4b4)
>> [   23.695591] [<c0058e2c>] (process_one_work) from [<c0059168>]
>> (worker_thread+0x3c/0x4a4)
>> [   23.704124] [<c0059168>] (worker_thread) from [<c005ee68>]
>> (kthread+0xd4/0xf0)
>> [   23.711747] [<c005ee68>] (kthread) from [<c000f598>]
>> (ret_from_fork+0x14/0x3c)
>> [   23.719357] Code: bad PC value
>> [   23.722760] ---[ end trace 981be8510db9b3a9 ]---
>>
>> Prevent oops by validationg power() pointer value before
>> calling the function.
>>
>> Signed-off-by: Uri Mashiach <uri.mashiach@...pulab.co.il>
>> Cc: stable@...r.kernel.org
>> Acked-by: Igor Grinberg <grinberg@...pulab.co.il>
>
> Please always provide a changelog when you resend patches, I lost track
> what I'm supposed to do with this. Should I apply or drop?
>
Sorry for not providing a changelog.
The patch should be applied.

-- 
Thanks,
Uri
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