linux-kernel - Re: [PATCH V1] scsi: ufs: qcom : Fix NULL pointer dereference in ufs_qcom_setup

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Message-ID: <dtz6mm5xq6kfo477fjezkrjnp5k5oijg6dhqziokglq6d5mazt@c2brkuhcveqc>
Date: Sun, 22 Jun 2025 20:55:12 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Nitin Rawat <quic_nitirawa@...cinc.com>
Cc: James.Bottomley@...senpartnership.com, martin.petersen@...cle.com, 
	bvanassche@....org, andersson@...nel.org, neil.armstrong@...aro.org, 
	konrad.dybcio@....qualcomm.com, dmitry.baryshkov@....qualcomm.com, quic_cang@...cinc.com, 
	vkoul@...nel.org, linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-scsi@...r.kernel.org, Naresh Kamboju <naresh.kamboju@...aro.org>, 
	Aishwarya <aishwarya.tcv@....com>, Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
Subject: Re: [PATCH V1] scsi: ufs: qcom : Fix NULL pointer dereference in
 ufs_qcom_setup_clocks

On Sun, Jun 22, 2025 at 04:15:31PM +0530, Nitin Rawat wrote:
> Fix a NULL pointer dereference in ufs_qcom_setup_clocks due to an
> uninitialized 'host' variable. The variable 'phy' is now assigned
> after confirming 'host' is not NULL.
> 
> Call Stack:
> 
> [    6.448070] Unable to handle kernel NULL pointer dereference at
> virtual address 0000000000000000
> [    6.448449] ufs_qcom_setup_clocks+0x28/0x148 ufs_qcom (P)
> [    6.448466] ufshcd_setup_clocks (drivers/ufs/core/ufshcd-priv.h:142)
> [    6.448477] ufshcd_init (drivers/ufs/core/ufshcd.c:9468)
> [    6.448485] ufshcd_pltfrm_init (drivers/ufs/host/ufshcd-pltfrm.c:504)
> [    6.448495] ufs_qcom_probe+0x28/0x68 ufs_qcom
> [    6.448508] platform_probe (drivers/base/platform.c:1404)
> [    6.448519] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:657)
> [    6.448526] __driver_probe_device (drivers/base/dd.c:799)
> [    6.448532] driver_probe_device (drivers/base/dd.c:829)
> [    6.448539] __driver_attach (drivers/base/dd.c:1216)
> [    6.448545] bus_for_each_dev (drivers/base/bus.c:370)
> [    6.448556] driver_attach (drivers/base/dd.c:1234)
> [    6.448567] bus_add_driver (drivers/base/bus.c:678)
> [    6.448577] driver_register (drivers/base/driver.c:249)
> [    6.448584] __platform_driver_register (drivers/base/platform.c:868)
> [    6.448592] ufs_qcom_pltform_init+0x28/0xff8 ufs_qcom
> [    6.448605] do_one_initcall (init/main.c:1274)
> [    6.448615] do_init_module (kernel/module/main.c:3041)
> [    6.448626] load_module (kernel/module/main.c:3511)
> [    6.448635] init_module_from_file (kernel/module/main.c:3704)
> [    6.448644] __arm64_sys_finit_module (kernel/module/main.c:3715.
> 

It is recommended to remove the timestamps from the call stack.

> Fixes: 77d2fa54a945 ("scsi: ufs: qcom : Refactor phy_power_on/off calls")
> 

Remove empty line.

> Tested-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Reported-by: Aishwarya <aishwarya.tcv@....com>
> Closes: https://lore.kernel.org/lkml/20250620214408.11028-1-aishwarya.tcv@arm.com/
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Closes: https://lore.kernel.org/linux-scsi/CA+G9fYuFQ2dBvYm1iB6rbwT=4b1c8e4NJ3yxqFPGZGUKH3GmMA@mail.gmail.com/T/#t
> Co-developed-by: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
> Signed-off-by: Ram Kumar Dwivedi <quic_rdwivedi@...cinc.com>
> Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

- Mani

> ---
>  drivers/ufs/host/ufs-qcom.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index ba4b2880279c..318dca7fe3d7 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -1124,7 +1124,7 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on,
>  				 enum ufs_notify_change_status status)
>  {
>  	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> -	struct phy *phy = host->generic_phy;
> +	struct phy *phy;
>  	int err;
> 
>  	/*
> @@ -1135,6 +1135,8 @@ static int ufs_qcom_setup_clocks(struct ufs_hba *hba, bool on,
>  	if (!host)
>  		return 0;
> 
> +	phy = host->generic_phy;
> +
>  	switch (status) {
>  	case PRE_CHANGE:
>  		if (on) {
> --
> 2.48.1
> 

-- 
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