linux-kernel - Re: [PATCH v7] misc: fastrpc: check qcom_scm_assign_mem() return in rpmsg

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Message-ID: <ie3hipmp5nqappyuwnxm2kpgscnl6qe42cwf2sep4inwunb5th@gontu4foua6q>
Date: Fri, 30 Jan 2026 04:38:38 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Xingjing Deng <micro6947@...il.com>
Cc: srini@...nel.org, amahesh@....qualcomm.com, arnd@...db.de,
        gregkh@...uxfoundation.org, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xingjing Deng <xjdeng@...a.edu.cn>, stable@...r.kernel.org
Subject: Re: [PATCH v7] misc: fastrpc: check qcom_scm_assign_mem() return in
 rpmsg_probe

On Fri, Jan 30, 2026 at 07:37:03AM +0800, Xingjing Deng wrote:
> In the SDSP probe path, qcom_scm_assign_mem() is used to assign the
> reserved memory to the configured VMIDs, but its return value was not checked.
> 
> Fail the probe if the SCM call fails to avoid continuing with an
> unexpected/incorrect memory permission configuration.
> 
> This issue was found by an in-house analysis workflow that extracts AST-based
> information and runs static checks, with LLM assistance for triage, and was
> confirmed by manual code review.
> No hardware testing was performed.
> 
> Fixes: c3c0363bc72d4 ("misc: fastrpc: support complete DMA pool access to the DSP")
> Cc: stable@...r.kernel.org # 6.11-rc1
> Signed-off-by: Xingjing Deng <xjdeng@...a.edu.cn>
> ---
> v7:
> - Add the detail description of how the tool detect.
> - Link to v6: https://lore.kernel.org/linux-arm-msm/20260128033454.2614886-1-xjdeng@buaa.edu.cn/
> 
> v6:
> - Add description of the detection tool.
> - Link to v5: https://lore.kernel.org/linux-arm-msm/20260117140351.875511-1-xjdeng@buaa.edu.cn/T/#u
> 
> v5:
> - Squash the functional change and indentation fix into a single patch.
> - Link to v4: https://lore.kernel.org/linux-arm-msm/2026011637-statute-showy-2c3f@gregkh/T/#t
> 
> v4:
> - Format the indentation
> - Link to v3: https://lore.kernel.org/linux-arm-msm/20260113084352.72itrloj5w7qb5o3@hu-mojha-hyd.qualcomm.com/T/#t
> 
> v3:
> - Add missing linux-kernel@...r.kernel.org to cc list.
> - Standarlize changelog placement/format.
> - Link to v2: https://lore.kernel.org/linux-arm-msm/20260113063618.e2ke47gy3hnfi67e@hu-mojha-hyd.qualcomm.com/T/#t
> 
> v2:
> - Add Fixes: and Cc: stable tags.
> - Link to v1: https://lore.kernel.org/linux-arm-msm/20260113022550.4029635-1-xjdeng@buaa.edu.cn/T/#u
> ---
>  drivers/misc/fastrpc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index ee652ef01534..8bac2216cb20 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -2337,8 +2337,11 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
>  		if (!err) {
>  			src_perms = BIT(QCOM_SCM_VMID_HLOS);
>  
> -			qcom_scm_assign_mem(res.start, resource_size(&res), &src_perms,
> +			err = qcom_scm_assign_mem(res.start, resource_size(&res), &src_perms,
>  				    data->vmperms, data->vmcount);
> +			if (err) {
> +				goto err_free_data;
> +			}

I think, checkpatch should warn here about unnecessary braces.

>  		}
>  
>  	}
> -- 
> 2.25.1
> 

-- 
With best wishes
Dmitry