ASoC: qcom: sdm845: add missing soundwire runtime stream alloc

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

ASoC: qcom: sdm845: add missing soundwire runtime stream alloc

During the migration of Soundwire runtime stream allocation from

the Qualcomm Soundwire controller to SoC's soundcard drivers the sdm845

soundcard was forgotten.

At this point any playback attempt or audio daemon startup, for instance

on sdm845-db845c (Qualcomm RB3 board), will result in stream pointer

NULL dereference:

Unable to handle kernel NULL pointer dereference at virtual

address 0000000000000020

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=0000000101ecf000

[0000000000000020] pgd=0000000000000000, p4d=0000000000000000

Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP

Modules linked in: ...

CPU: 5 UID: 0 PID: 1198 Comm: aplay

Not tainted 6.12.0-rc2-qcomlt-arm64-00059-g9d78f315a362-dirty #18

Hardware name: Thundercomm Dragonboard 845c (DT)

pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : sdw_stream_add_slave+0x44/0x380 [soundwire_bus]

lr : sdw_stream_add_slave+0x44/0x380 [soundwire_bus]

sp : ffff80008a2035c0

x29: ffff80008a2035c0 x28: ffff80008a203978 x27: 0000000000000000

x26: 00000000000000c0 x25: 0000000000000000 x24: ffff1676025f4800

x23: ffff167600ff1cb8 x22: ffff167600ff1c98 x21: 0000000000000003

x20: ffff167607316000 x19: ffff167604e64e80 x18: 0000000000000000

x17: 0000000000000000 x16: ffffcec265074160 x15: 0000000000000000

x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000

x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000

x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff167600ff1cec

x5 : ffffcec22cfa2010 x4 : 0000000000000000 x3 : 0000000000000003

x2 : ffff167613f836c0 x1 : 0000000000000000 x0 : ffff16761feb60b8

Call trace:

sdw_stream_add_slave+0x44/0x380 [soundwire_bus]

wsa881x_hw_params+0x68/0x80 [snd_soc_wsa881x]

snd_soc_dai_hw_params+0x3c/0xa4

__soc_pcm_hw_params+0x230/0x660

dpcm_be_dai_hw_params+0x1d0/0x3f8

dpcm_fe_dai_hw_params+0x98/0x268

snd_pcm_hw_params+0x124/0x460

snd_pcm_common_ioctl+0x998/0x16e8

snd_pcm_ioctl+0x34/0x58

__arm64_sys_ioctl+0xac/0xf8

invoke_syscall+0x48/0x104

el0_svc_common.constprop.0+0x40/0xe0

do_el0_svc+0x1c/0x28

el0_svc+0x34/0xe0

el0t_64_sync_handler+0x120/0x12c

el0t_64_sync+0x190/0x194

Code: aa0403fb f9418400 9100e000 9400102f (f8420f22)

---[ end trace 0000000000000000 ]---

0000000000006108 <sdw_stream_add_slave>:

6108: d503233f paciasp

610c: a9b97bfd stp x29, x30, [sp, #-112]!

6110: 910003fd mov x29, sp

6114: a90153f3 stp x19, x20, [sp, #16]

6118: a9025bf5 stp x21, x22, [sp, #32]

611c: aa0103f6 mov x22, x1

6120: 2a0303f5 mov w21, w3

6124: a90363f7 stp x23, x24, [sp, #48]

6128: aa0003f8 mov x24, x0

612c: aa0203f7 mov x23, x2

6130: a9046bf9 stp x25, x26, [sp, #64]

6134: aa0403f9 mov x25, x4 <-- x4 copied to x25

6138: a90573fb stp x27, x28, [sp, #80]

613c: aa0403fb mov x27, x4

6140: f9418400 ldr x0, [x0, #776]

6144: 9100e000 add x0, x0, #0x38

6148: 94000000 bl 0 <mutex_lock>

614c: f8420f22 ldr x2, [x25, #32]! <-- offset 0x44

^^^

This is 0x6108 + offset 0x44 from the beginning of sdw_stream_add_slave()

where data abort happens.

wsa881x_hw_params() is called with stream = NULL and passes it further

in register x4 (5th argu

---truncated---