netdev - Re: [PATCH net-next v3 3/5] dpll: zl3073x: Add firmware loading functionality

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Message-ID: <20250818192203.364c73b1@kernel.org>
Date: Mon, 18 Aug 2025 19:22:03 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Ivan Vecera <ivecera@...hat.com>
Cc: netdev@...r.kernel.org, Jiri Pirko <jiri@...nulli.us>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Jonathan Corbet
 <corbet@....net>, Prathosh Satish <Prathosh.Satish@...rochip.com>,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, Michal Schmidt
 <mschmidt@...hat.com>, Petr Oros <poros@...hat.com>, Przemek Kitszel
 <przemyslaw.kitszel@...el.com>
Subject: Re: [PATCH net-next v3 3/5] dpll: zl3073x: Add firmware loading
 functionality

On Wed, 13 Aug 2025 19:44:06 +0200 Ivan Vecera wrote:
> +#define ZL3073X_FW_ERR_MSG(_zldev, _extack, _msg, ...)			\
> +	do {								\
> +		dev_err((_zldev)->dev, ZL3073X_FW_ERR_PFX _msg "\n",	\
> +			## __VA_ARGS__);				\
> +		NL_SET_ERR_MSG_FMT_MOD((_extack),			\
> +				       ZL3073X_FW_ERR_PFX _msg,		\
> +				       ## __VA_ARGS__);			\
> +	} while (0)

Please don't duplicate the messages to the logs.
If devlink error reporting doesn't work it needs to be fixed 
in the core.

> +static ssize_t
> +zl3073x_fw_component_load(struct zl3073x_dev *zldev,
> +			  struct zl3073x_fw_component **pcomp,
> +			  const char **psrc, size_t *psize,
> +			  struct netlink_ext_ack *extack)
> +{
> +	const struct zl3073x_fw_component_info *info;
> +	struct zl3073x_fw_component *comp = NULL;
> +	struct device *dev = zldev->dev;
> +	enum zl3073x_fw_component_id id;
> +	char buf[32], name[16];
> +	u32 count, size, *dest;
> +	int pos, rc;
> +
> +	/* Fetch image name and size from input */
> +	strscpy(buf, *psrc, min(sizeof(buf), *psize));
> +	rc = sscanf(buf, "%15s %u %n", name, &count, &pos);
> +	if (!rc) {
> +		/* No more data */
> +		return 0;
> +	} else if (rc == 1) {
> +		ZL3073X_FW_ERR_MSG(zldev, extack, "invalid component size");
> +		return -EINVAL;
> +	}
> +	*psrc += pos;
> +	*psize -= pos;

what if pos > *psize ? I think the parsing needs more care.