linux-kernel - Re: [PATCH 2/5] input: misc: Add IBM Operation Panel driver

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Message-ID: <20200901061108.GB1148@ninjato>
Date:   Tue, 1 Sep 2020 08:11:08 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-aspeed@...ts.ozlabs.org,
        linux-i2c@...r.kernel.org, joel@....id.au, andrew@...id.au,
        benh@...nel.crashing.org, brendanhiggins@...gle.com,
        dmitry.torokhov@...il.com, robh+dt@...nel.org
Subject: Re: [PATCH 2/5] input: misc: Add IBM Operation Panel driver


> +	switch (event) {
> +	case I2C_SLAVE_STOP:
> +		command_size = panel->idx;
> +		fallthrough;
> +	case I2C_SLAVE_WRITE_REQUESTED:
> +		panel->idx = 0;
> +		break;
> +	case I2C_SLAVE_WRITE_RECEIVED:
> +		if (panel->idx < sizeof(panel->command))
> +			panel->command[panel->idx++] = *val;
> +		else
> +			dev_dbg(&panel->input->dev, "command truncated\n");

Just double checking: Do you really want to process truncated commands?
Since you detect the state here, you could also choose to reject such
commands?


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