bid_keyword_list(const char *p,  ssize_t len, int unset, int last_is_path)
{
	int l;
	int keycnt = 0;

	while (len > 0 && *p) {
		int blank = 0;

		/* Test whether there are blank characters in the line. */
		while (len >0 && (*p == ' ' || *p == '\t')) {
			++p;
			--len;
			blank = 1;
		}
		if (*p == '\n' || *p == '\r')
			break;
		if (p[0] == '\\' && (p[1] == '\n' || p[1] == '\r'))
			break;
		if (!blank && !last_is_path) /* No blank character. */
			return (-1);
		if (last_is_path && len == 0)
				return (keycnt);

		if (unset) {
			l = bid_keycmp(p, "all", len);
			if (l > 0)
				return (1);
		}
		/* Test whether there is a correct key in the line. */
		l = bid_keyword(p, len);
		if (l == 0)
			return (-1);/* Unknown keyword was found. */
		p += l;
		len -= l;
		keycnt++;

		/* Skip value */
		if (*p == '=') {
			int value = 0;
			++p;
			--len;
			while (len > 0 && *p != ' ' && *p != '\t') {
				++p;
				--len;
				value = 1;
			}
			/* A keyword should have a its value unless
			 * "/unset" operation. */ 
			if (!unset && value == 0)
				return (-1);
		}
	}
	return (keycnt);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.