Re: wlcore/wl12xx: spi: fix NULL pointer dereference (Oops)

[Kalle Valo <kvalo-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

> 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-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>
> Cc: stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> Acked-by: Igor Grinberg <grinberg-UTxiZqZC01RS1MOuV/RT9w@public.gmane.org>

Thanks, applied to wireless-drivers-next.git.

Kalle Valo
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