linux-kernel - Re: [PATCH] soc: qcom: qmi_interface: Limit txn ids to U16

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Message-ID: <20181004043759.GB1656@tuxbook-pro>
Date:   Wed, 3 Oct 2018 21:37:59 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Arun Kumar Neelakantam <aneela@...eaurora.org>
Cc:     davem@...emloft.net, clew@...eaurora.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        fw@...len.de, hannes@...essinduktion.org, dvlasenk@...hat.com,
        nicolas.dechesne@...aro.org, Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>
Subject: Re: [PATCH] soc: qcom: qmi_interface: Limit txn ids to U16_MAX

On Tue 02 Oct 22:40 PDT 2018, Arun Kumar Neelakantam wrote:

> Txn IDs created up to INT_MAX cause overflow while storing
> the IDs in u16 type supported by QMI header.
> 
> Limit the txn IDs max value to U16_MAX to avoid overflow.
> 
> Signed-off-by: Arun Kumar Neelakantam <aneela@...eaurora.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/soc/qcom/qmi_interface.c | 2 +-
>  include/linux/soc/qcom/qmi.h     | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/qcom/qmi_interface.c b/drivers/soc/qcom/qmi_interface.c
> index 938ca41c..c239a28 100644
> --- a/drivers/soc/qcom/qmi_interface.c
> +++ b/drivers/soc/qcom/qmi_interface.c
> @@ -318,7 +318,7 @@ int qmi_txn_init(struct qmi_handle *qmi, struct qmi_txn *txn,
>  	txn->dest = c_struct;
>  
>  	mutex_lock(&qmi->txn_lock);
> -	ret = idr_alloc_cyclic(&qmi->txns, txn, 0, INT_MAX, GFP_KERNEL);
> +	ret = idr_alloc_cyclic(&qmi->txns, txn, 0, U16_MAX, GFP_KERNEL);
>  	if (ret < 0)
>  		pr_err("failed to allocate transaction id\n");
>  
> diff --git a/include/linux/soc/qcom/qmi.h b/include/linux/soc/qcom/qmi.h
> index f4de336..5efa2b6 100644
> --- a/include/linux/soc/qcom/qmi.h
> +++ b/include/linux/soc/qcom/qmi.h
> @@ -166,7 +166,7 @@ struct qmi_ops {
>  struct qmi_txn {
>  	struct qmi_handle *qmi;
>  
> -	int id;
> +	u16 id;
>  
>  	struct mutex lock;
>  	struct completion completion;
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>