Re: wifi: mwifiex: Do not return unused priv in mwifiex_get_priv_by_id()

[Kalle Valo]

Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> wrote:

> mwifiex_get_priv_by_id() returns the priv pointer corresponding to
> the bss_num and bss_type, but without checking if the priv is actually
> currently in use.
> Unused priv pointers do not have a wiphy attached to them which can
> lead to NULL pointer dereferences further down the callstack.  Fix
> this by returning only used priv pointers which have priv->bss_mode
> set to something else than NL80211_IFTYPE_UNSPECIFIED.
> 
> Said NULL pointer dereference happened when an Accesspoint was started
> with wpa_supplicant -i mlan0 with this config:
> 
> network={
>         ssid="somessid"
>         mode=2
>         frequency=2412
>         key_mgmt=WPA-PSK WPA-PSK-SHA256
>         proto=RSN
>         group=CCMP
>         pairwise=CCMP
>         psk="12345678"
> }
> 
> When waiting for the AP to be established, interrupting wpa_supplicant
> with <ctrl-c> and starting it again this happens:
> 
> | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000140
> | Mem abort info:
> |   ESR = 0x0000000096000004
> |   EC = 0x25: DABT (current EL), IL = 32 bits
> |   SET = 0, FnV = 0
> |   EA = 0, S1PTW = 0
> |   FSC = 0x04: level 0 translation fault
> | Data abort info:
> |   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
> |   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
> |   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> | user pgtable: 4k pages, 48-bit VAs, pgdp=0000000046d96000
> | [0000000000000140] pgd=0000000000000000, p4d=0000000000000000
> | Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
> | Modules linked in: caam_jr caamhash_desc spidev caamalg_desc crypto_engine authenc libdes mwifiex_sdio
> +mwifiex crct10dif_ce cdc_acm onboard_usb_hub fsl_imx8_ddr_perf imx8m_ddrc rtc_ds1307 lm75 rtc_snvs
> +imx_sdma caam imx8mm_thermal spi_imx error imx_cpufreq_dt fuse ip_tables x_tables ipv6
> | CPU: 0 PID: 8 Comm: kworker/0:1 Not tainted 6.9.0-00007-g937242013fce-dirty #18
> | Hardware name: somemachine (DT)
> | Workqueue: events sdio_irq_work
> | pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> | pc : mwifiex_get_cfp+0xd8/0x15c [mwifiex]
> | lr : mwifiex_get_cfp+0x34/0x15c [mwifiex]
> | sp : ffff8000818b3a70
> | x29: ffff8000818b3a70 x28: ffff000006bfd8a5 x27: 0000000000000004
> | x26: 000000000000002c x25: 0000000000001511 x24: 0000000002e86bc9
> | x23: ffff000006bfd996 x22: 0000000000000004 x21: ffff000007bec000
> | x20: 000000000000002c x19: 0000000000000000 x18: 0000000000000000
> | x17: 000000040044ffff x16: 00500072b5503510 x15: ccc283740681e517
> | x14: 0201000101006d15 x13: 0000000002e8ff43 x12: 002c01000000ffb1
> | x11: 0100000000000000 x10: 02e8ff43002c0100 x9 : 0000ffb100100157
> | x8 : ffff000003d20000 x7 : 00000000000002f1 x6 : 00000000ffffe124
> | x5 : 0000000000000001 x4 : 0000000000000003 x3 : 0000000000000000
> | x2 : 0000000000000000 x1 : 0001000000011001 x0 : 0000000000000000
> | Call trace:
> |  mwifiex_get_cfp+0xd8/0x15c [mwifiex]
> |  mwifiex_parse_single_response_buf+0x1d0/0x504 [mwifiex]
> |  mwifiex_handle_event_ext_scan_report+0x19c/0x2f8 [mwifiex]
> |  mwifiex_process_sta_event+0x298/0xf0c [mwifiex]
> |  mwifiex_process_event+0x110/0x238 [mwifiex]
> |  mwifiex_main_process+0x428/0xa44 [mwifiex]
> |  mwifiex_sdio_interrupt+0x64/0x12c [mwifiex_sdio]
> |  process_sdio_pending_irqs+0x64/0x1b8
> |  sdio_irq_work+0x4c/0x7c
> |  process_one_work+0x148/0x2a0
> |  worker_thread+0x2fc/0x40c
> |  kthread+0x110/0x114
> |  ret_from_fork+0x10/0x20
> | Code: a94153f3 a8c37bfd d50323bf d65f03c0 (f940a000)
> | ---[ end trace 0000000000000000 ]---
> 
> Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> Acked-by: Brian Norris <briannorris@xxxxxxxxxxxx>
> Reviewed-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx>

Patch applied to wireless-next.git, thanks.

c145eea2f75f wifi: mwifiex: Do not return unused priv in mwifiex_get_priv_by_id()

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20240703072409.556618-1-s.hauer@xxxxxxxxxxxxxx/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches