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![Sudeep Holla](/assets/img/avatar_default.png)
Without the bound checks for scpi_pd->name, it could result in the buffer
overflow when copying the SCPI device name from the corresponding device
tree node as the name string is set at maximum size of 30.
Let us fix it by using devm_kasprintf so that the string buffer is
allocated dynamically.
Fixes: 8bec4337ad
("firmware: scpi: add device power domain support using genpd")
Reported-by: Pedro Batista <pedbap.g@gmail.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Cc: stable@vger.kernel.org
Cc: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20211209120456.696879-1-sudeep.holla@arm.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
156 lines
3.8 KiB
C
156 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* SCPI Generic power domain support.
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*
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* Copyright (C) 2016 ARM Ltd.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/pm_domain.h>
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#include <linux/scpi_protocol.h>
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struct scpi_pm_domain {
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struct generic_pm_domain genpd;
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struct scpi_ops *ops;
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u32 domain;
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};
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/*
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* These device power state values are not well-defined in the specification.
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* In case, different implementations use different values, we can make these
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* specific to compatibles rather than getting these values from device tree.
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*/
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enum scpi_power_domain_state {
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SCPI_PD_STATE_ON = 0,
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SCPI_PD_STATE_OFF = 3,
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};
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#define to_scpi_pd(gpd) container_of(gpd, struct scpi_pm_domain, genpd)
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static int scpi_pd_power(struct scpi_pm_domain *pd, bool power_on)
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{
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int ret;
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enum scpi_power_domain_state state;
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if (power_on)
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state = SCPI_PD_STATE_ON;
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else
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state = SCPI_PD_STATE_OFF;
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ret = pd->ops->device_set_power_state(pd->domain, state);
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if (ret)
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return ret;
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return !(state == pd->ops->device_get_power_state(pd->domain));
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}
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static int scpi_pd_power_on(struct generic_pm_domain *domain)
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{
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struct scpi_pm_domain *pd = to_scpi_pd(domain);
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return scpi_pd_power(pd, true);
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}
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static int scpi_pd_power_off(struct generic_pm_domain *domain)
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{
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struct scpi_pm_domain *pd = to_scpi_pd(domain);
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return scpi_pd_power(pd, false);
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}
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static int scpi_pm_domain_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct scpi_pm_domain *scpi_pd;
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struct genpd_onecell_data *scpi_pd_data;
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struct generic_pm_domain **domains;
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struct scpi_ops *scpi_ops;
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int ret, num_domains, i;
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scpi_ops = get_scpi_ops();
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if (!scpi_ops)
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return -EPROBE_DEFER;
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if (!np) {
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dev_err(dev, "device tree node not found\n");
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return -ENODEV;
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}
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if (!scpi_ops->device_set_power_state ||
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!scpi_ops->device_get_power_state) {
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dev_err(dev, "power domains not supported in the firmware\n");
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return -ENODEV;
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}
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ret = of_property_read_u32(np, "num-domains", &num_domains);
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if (ret) {
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dev_err(dev, "number of domains not found\n");
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return -EINVAL;
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}
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scpi_pd = devm_kcalloc(dev, num_domains, sizeof(*scpi_pd), GFP_KERNEL);
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if (!scpi_pd)
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return -ENOMEM;
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scpi_pd_data = devm_kzalloc(dev, sizeof(*scpi_pd_data), GFP_KERNEL);
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if (!scpi_pd_data)
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return -ENOMEM;
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domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL);
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if (!domains)
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return -ENOMEM;
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for (i = 0; i < num_domains; i++, scpi_pd++) {
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domains[i] = &scpi_pd->genpd;
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scpi_pd->domain = i;
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scpi_pd->ops = scpi_ops;
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scpi_pd->genpd.name = devm_kasprintf(dev, GFP_KERNEL,
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"%pOFn.%d", np, i);
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if (!scpi_pd->genpd.name) {
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dev_err(dev, "Failed to allocate genpd name:%pOFn.%d\n",
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np, i);
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continue;
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}
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scpi_pd->genpd.power_off = scpi_pd_power_off;
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scpi_pd->genpd.power_on = scpi_pd_power_on;
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/*
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* Treat all power domains as off at boot.
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*
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* The SCP firmware itself may have switched on some domains,
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* but for reference counting purpose, keep it this way.
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*/
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pm_genpd_init(&scpi_pd->genpd, NULL, true);
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}
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scpi_pd_data->domains = domains;
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scpi_pd_data->num_domains = num_domains;
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of_genpd_add_provider_onecell(np, scpi_pd_data);
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return 0;
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}
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static const struct of_device_id scpi_power_domain_ids[] = {
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{ .compatible = "arm,scpi-power-domains", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, scpi_power_domain_ids);
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static struct platform_driver scpi_power_domain_driver = {
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.driver = {
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.name = "scpi_power_domain",
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.of_match_table = scpi_power_domain_ids,
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},
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.probe = scpi_pm_domain_probe,
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};
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module_platform_driver(scpi_power_domain_driver);
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MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
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MODULE_DESCRIPTION("ARM SCPI power domain driver");
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MODULE_LICENSE("GPL v2");
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