phy: renesas: rcar-gen3-usb2: Fix sysfs interface of "role"

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>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index 49ec67d46ccc5a376e6dff199493944e0084267d..bfb22f868857fc4208ed6a693eb316bd28650213 100644 (file)
--- 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;