Since the role_store() uses strncmp(), it's possible to refer out-of-memory if the sysfs data size is smaller than strlen("host"). This patch fixes it by using sysfs_streq() instead of strncmp().

Reported-by: Pavel Machek pavel@denx.de Fixes: 9bb86777fb71 ("phy: rcar-gen3-usb2: add sysfs for usb role swap") Cc: stable@vger.kernel.org # v4.10+ Signed-off-by: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com Reviewed-by: Geert Uytterhoeven geert+renesas@glider.be Acked-by: Pavel Machek pavel@denx.de --- Changes from v1: - Rebase on v5.4-rc2. - Add Reviewed-by and Acked-by tags. https://patchwork.kernel.org/patch/11067371/

drivers/phy/renesas/phy-rcar-gen3-usb2.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c index b7f6b13..6fd1390 100644 --- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c +++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c @@ -21,6 +21,7 @@ #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> +#include <linux/string.h> #include <linux/usb/of.h> #include <linux/workqueue.h>

@@ -320,9 +321,9 @@ static ssize_t role_store(struct device *dev, struct device_attribute *attr, if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch)) return -EIO;

- if (!strncmp(buf, "host", strlen("host"))) + if (sysfs_streq(buf, "host")) new_mode = PHY_MODE_USB_HOST; - else if (!strncmp(buf, "peripheral", strlen("peripheral"))) + else if (sysfs_streq(buf, "peripheral")) new_mode = PHY_MODE_USB_DEVICE; else return -EINVAL;