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Message-ID: <93dd0930-8699-9995-c9ac-d361c4c385f1@linaro.org>
Date:   Mon, 31 Jul 2023 10:15:34 +0200
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Subject: Re: [PATCH 2/4] soc: qcom: aoss: Add debugfs interface for sending
 messages
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To:     Bjorn Andersson <quic_bjorande@quicinc.com>,
        Bjorn Andersson <andersson@kernel.org>,
        Chris Lew <quic_clew@quicinc.com>
Cc:     Alex Elder <elder@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org
References: <20230731041013.2950307-1-quic_bjorande@quicinc.com>
 <20230731041013.2950307-3-quic_bjorande@quicinc.com>
From:   Konrad Dybcio <konrad.dybcio@linaro.org>
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On 31.07.2023 06:10, Bjorn Andersson wrote:
> From: Chris Lew <clew@codeaurora.org>
No QUIC email?

[...]


> +static ssize_t qmp_debugfs_write(struct file *file, const char __user *userstr,
> +				 size_t len, loff_t *pos)
> +{
> +	struct qmp *qmp = file->private_data;
> +	char buf[QMP_MSG_LEN];
> +	int ret;
> +
> +	if (!len || len > QMP_MSG_LEN)
>=? Otherwise the last char may be overwritten by the NULL termination
couple lines below

> +		return -EINVAL;
> +
> +	if (copy_from_user(buf, userstr, len))
> +		return -EFAULT;
> +	buf[len] = '\0';
> +
> +	ret = qmp_send(qmp, buf);
> +	if (ret < 0)
> +		return ret;
> +
> +	return len;
> +}
Konrad