wifi: mt76: mt7915: fix oops on non-dbdc mt7986

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7915: fix oops on non-dbdc mt7986

mt7915_band_config() sets band_idx = 1 on the main phy for mt7986

with MT7975_ONE_ADIE or MT7976_ONE_ADIE.

Commit 0335c034e726 ("wifi: mt76: fix race condition related to

checking tx queue fill status") introduced a dereference of the

phys array indirectly indexed by band_idx via wcid->phy_idx in

mt76_wcid_cleanup(). This caused the following Oops on affected

mt7986 devices:

Unable to handle kernel read from unreadable memory at virtual address 0000000000000024

Mem abort info:

ESR = 0x0000000096000005

EC = 0x25: DABT (current EL), IL = 32 bits

SET = 0, FnV = 0

EA = 0, S1PTW = 0

FSC = 0x05: level 1 translation fault

Data abort info:

ISV = 0, ISS = 0x00000005

CM = 0, WnR = 0

user pgtable: 4k pages, 39-bit VAs, pgdp=0000000042545000

[0000000000000024] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000

Internal error: Oops: 0000000096000005 [#1] SMP

Modules linked in: ... mt7915e mt76_connac_lib mt76 mac80211 cfg80211 ...

CPU: 2 PID: 1631 Comm: hostapd Not tainted 5.15.150 #0

Hardware name: ZyXEL EX5700 (Telenor) (DT)

pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : mt76_wcid_cleanup+0x84/0x22c [mt76]

lr : mt76_wcid_cleanup+0x64/0x22c [mt76]

sp : ffffffc00a803700

x29: ffffffc00a803700 x28: ffffff80008f7300 x27: ffffff80003f3c00

x26: ffffff80000a7880 x25: ffffffc008c26e00 x24: 0000000000000001

x23: ffffffc000a68114 x22: 0000000000000000 x21: ffffff8004172cc8

x20: ffffffc00a803748 x19: ffffff8004152020 x18: 0000000000000000

x17: 00000000000017c0 x16: ffffffc008ef5000 x15: 0000000000000be0

x14: ffffff8004172e28 x13: ffffff8004172e28 x12: 0000000000000000

x11: 0000000000000000 x10: ffffff8004172e30 x9 : ffffff8004172e28

x8 : 0000000000000000 x7 : ffffff8004156020 x6 : 0000000000000000

x5 : 0000000000000031 x4 : 0000000000000000 x3 : 0000000000000001

x2 : 0000000000000000 x1 : ffffff80008f7300 x0 : 0000000000000024

Call trace:

mt76_wcid_cleanup+0x84/0x22c [mt76]

__mt76_sta_remove+0x70/0xbc [mt76]

mt76_sta_state+0x8c/0x1a4 [mt76]

mt7915_eeprom_get_power_delta+0x11e4/0x23a0 [mt7915e]

drv_sta_state+0x144/0x274 [mac80211]

sta_info_move_state+0x1cc/0x2a4 [mac80211]

sta_set_sinfo+0xaf8/0xc24 [mac80211]

sta_info_destroy_addr_bss+0x4c/0x6c [mac80211]

ieee80211_color_change_finish+0x1c08/0x1e70 [mac80211]

cfg80211_check_station_change+0x1360/0x4710 [cfg80211]

genl_family_rcv_msg_doit+0xb4/0x110

genl_rcv_msg+0xd0/0x1bc

netlink_rcv_skb+0x58/0x120

genl_rcv+0x34/0x50

netlink_unicast+0x1f0/0x2ec

netlink_sendmsg+0x198/0x3d0

____sys_sendmsg+0x1b0/0x210

___sys_sendmsg+0x80/0xf0

__sys_sendmsg+0x44/0xa0

__arm64_sys_sendmsg+0x20/0x30

invoke_syscall.constprop.0+0x4c/0xe0

do_el0_svc+0x40/0xd0

el0_svc+0x14/0x4c

el0t_64_sync_handler+0x100/0x110

el0t_64_sync+0x15c/0x160

Code: d2800002 910092c0 52800023 f9800011 (885f7c01)

---[ end trace 7e42dd9a39ed2281 ]---

Fix by using mt76_dev_phy() which will map band_idx to the correct phy

for all hardware combinations.