Re: [PATCH v5 01/22] bootconfig: Add Extra Boot Config support

[Steven Rostedt <rostedt@goodmis.org>]

On Thu, 26 Dec 2019 23:04:00 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:


> +/**
> + * xbc_node_is_value() - Test the node is a value node
> + * @node: An XBC node.
> + *
> + * Test the @node is a value node and return true if a value node, false if not.
> + */
> +static inline __init bool xbc_node_is_value(struct xbc_node *node)
> +{
> +	return !!(node->data & XBC_VALUE);

The "!!" is not needed, as this is a static inline bool function. The
compiler will make this a 1 or 0 without it.

	return node->data & XBC_VALUE;

is sufficient.

> +}
> +
> +/**
> + * xbc_node_is_key() - Test the node is a key node
> + * @node: An XBC node.
> + *
> + * Test the @node is a key node and return true if a key node, false if not.
> + */
> +static inline __init bool xbc_node_is_key(struct xbc_node *node)
> +{
> +	return !(node->data & XBC_VALUE);
> +}
> +



> +
> +/*
> + * Return delimiter or error, no node added. As same as lib/cmdline.c,
> + * you can use " around spaces, but can't escape " for value.
> + */
> +static int __init __xbc_parse_value(char **__v, char **__n)
> +{
> +	char *p, *v = *__v;
> +	int c, quotes = 0;
> +
> +	v = skip_spaces(v);
> +	while (*v == '#') {
> +		v = skip_comment(v);
> +		v = skip_spaces(v);
> +	}
> +	if (*v == '"' || *v == '\'') {
> +		quotes = *v;
> +		v++;
> +	}
> +	p = v - 1;
> +	while ((c = *++p)) {
> +		if (!isprint(c) && !isspace(c))
> +			return xbc_parse_error("Non printable value", p);
> +		if (quotes) {
> +			if (c != quotes)
> +				continue;
> +			quotes = 0;
> +			*p++ = '\0';
> +			p = skip_spaces(p);

Hmm, if p here == "    \0" then skip_spaces() will make p == "\0"

> +			c = *p;
> +			if (c && !strchr(",;\n#}", c))
> +				return xbc_parse_error("No value delimiter", p);
> +			p++;

Now p == one passed "\0" which is in unknown territory.

> +			break;
> +		}
> +		if (strchr(",;\n#}", c)) {

Also, why are we looking at '\n'? as wouldn't that get skipped by
skip_spaces() too?

-- Steve

> +			v = strim(v);
> +			*p++ = '\0';
> +			break;
> +		}
> +	}
> +	if (quotes)
> +		return xbc_parse_error("No closing quotes", p);
> +	if (c == '#') {
> +		p = skip_comment(p);
> +		c = *p;
> +	}
> +	*__n = p;
> +	*__v = v;
> +
> +	return c;
> +}
> +