linux-kernel - Re: [PATCH v2 0/4] ASoC: qcom: sdw: fix memory leak

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Message-ID: <20251022003429.4445-1-threeway@gmail.com>
Date: Tue, 21 Oct 2025 19:34:29 -0500
From: Steev Klimaszewski <threeway@...il.com>
To: srinivas.kandagatla@....qualcomm.com
Cc: Stable@...r.kernel.org,
	alexey.klimov@...aro.org,
	broonie@...nel.org,
	krzysztof.kozlowski@...aro.org,
	linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-sound@...r.kernel.org,
	perex@...ex.cz,
	srini@...nel.org,
	tiwai@...e.com
Subject: Re: [PATCH v2 0/4] ASoC: qcom: sdw: fix memory leak

Hi Srini,

On the Thinkpad X13s, with this patchset applied, we end up seeing a NULL
pointer 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=000000010abfe000
pgd=0000000000000000, p4d=0000000000000000
 SMP
 pdr_interface(E) crc8(E) phy_qcom_qmp_pcie(E) icc_osm_l3(E) gpio_sbu_mux(E) qcom_wdt(E) typec(E) qcom_pdr_msg(E) qmi_helpers(E) smp2p(E) rpmsg_core(E) fixed(E) gpio_keys(E) qnoc_sc8280xp(E) pwm_bl(E) smem(E) efivarfs(E)
CPU: 5 UID: 111 PID: 1501 Comm: wireplumber Tainted: G            E       6.17.4 #2 PREEMPTLAZY
Tainted: [E]=UNSIGNED_MODULE
Hardware name: LENOVO 21BX0015US/21BX0015US, BIOS N3HET94W (1.66 ) 09/15/2025
pstate: 60401005 (nZCv daif +PAN -UAO -TCO -DIT +SSBS BTYPE=--)
pc : sdw_stream_add_slave+0x4c/0x440 [soundwire_bus]
lr : sdw_stream_add_slave+0x4c/0x440 [soundwire_bus]
sp : ffff80008bc2b250
x29: ffff80008bc2b250 x28: ffff0000a56b2f88 x27: 0000000000000000
x26: 0000000000000000 x25: ffff0000a301b000 x24: 0000000000000000
x23: ffff0000e8ce0280 x22: 0000000000000000 x21: 0000000000000000
x20: ffff80008bc2b300 x19: ffff0000a305a880 x18: 0000000000000000
x17: 0000000000000000 x16: ffffb9859eb15c48 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000000000 x9 : ffffb985391c0614
x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff0000a56b2fd0
x5 : ffff0000a56b2f80 x4 : 0000000000000000 x3 : 0000000000000000
x2 : ffff0000eb005000 x1 : 0000000000000000 x0 : ffff00011de2c890
Call trace:
(P)
 wcd938x_sdw_hw_params+0xa8/0x200 [snd_soc_wcd938x_sdw]
 wcd938x_codec_hw_params+0x48/0x88 [snd_soc_wcd938x]
 snd_soc_dai_hw_params+0x44/0x90 [snd_soc_core]
 __soc_pcm_hw_params+0x230/0x620 [snd_soc_core]
 dpcm_be_dai_hw_params+0x260/0x888 [snd_soc_core]
 dpcm_fe_dai_hw_params+0xc4/0x3b0 [snd_soc_core]
 snd_pcm_hw_params+0x180/0x468 [snd_pcm]
 snd_pcm_common_ioctl+0xc00/0x18b8 [snd_pcm]
 snd_pcm_ioctl+0x38/0x60 [snd_pcm]
 __arm64_sys_ioctl+0xac/0x108
 invoke_syscall.constprop.0+0x64/0xe8
 el0_svc_common.constprop.0+0xc0/0xe8
 do_el0_svc+0x24/0x38
 el0_svc+0x3c/0x170
 el0t_64_sync_handler+0xa0/0xf0
 el0t_64_sync+0x198/0x1a0
Code: f9418c00 b9006fe3 91004000 97ffe306 (f8420f43)
---[ end trace 0000000000000000 ]---

-- steev