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

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Message-ID: <76567559-4cac-467f-9740-e8a539a445f7@oss.qualcomm.com>
Date: Wed, 22 Oct 2025 10:52:18 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>
To: Steev Klimaszewski <threeway@...il.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

On 10/22/25 1:34 AM, Steev Klimaszewski wrote:
> Hi Srini,
> 
> On the Thinkpad X13s, with this patchset applied, we end up seeing a NULL
> pointer dereference:
> 

Thanks Steev,
I think I know the issue, There was a silly typo in 3/4 patch.
Could you please try this change, I will send this in v3 anyway;


-------------------------->cut<------------------------
diff --git a/sound/soc/qcom/sdw.c b/sound/soc/qcom/sdw.c
index 16bf09db29f5..6576b47a4c8c 100644
--- a/sound/soc/qcom/sdw.c
+++ b/sound/soc/qcom/sdw.c
@@ -31,6 +31,7 @@ static bool qcom_snd_is_sdw_dai(int id)
 	case RX_CODEC_DMA_RX_6:
 	case RX_CODEC_DMA_RX_7:
 	case SLIMBUS_0_RX...SLIMBUS_6_TX:
+		return true;
 	default:
 		break;
 	}

-------------------------->cut<------------------------

thanks,
Srini> 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