patch "usb: gadget: udc: renesas_usb3: Fix sysfs interface of "role"" added to usb-linus

This is a note to let you know that I've just added the patch titled

usb: gadget: udc: renesas_usb3: Fix sysfs interface of "role"

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 5dac665cf403967bb79a7aeb8c182a621fe617ff Mon Sep 17 00:00:00 2001
From: Yoshihiro Shimoda <[email protected]>
Date: Wed, 31 Jul 2019 19:15:43 +0900
Subject: usb: gadget: udc: renesas_usb3: 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().

---
 drivers/usb/gadget/udc/renesas_usb3.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

index 87062d22134d..1f4c3fbd1df8 100644
@@ -19,6 +19,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/sizes.h>
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <linux/sys_soc.h>
 #include <linux/uaccess.h>
 #include <linux/usb/ch9.h>

@@ -2450,9 +2451,9 @@ static ssize_t role_store(struct device *dev, struct device_attribute *attr,
 	if (usb3->forced_b_device)
 		return -EBUSY;
 
-	if (!strncmp(buf, "host", strlen("host")))
+	if (sysfs_streq(buf, "host"))
 		new_mode_is_host = true;
-	else if (!strncmp(buf, "peripheral", strlen("peripheral")))
+	else if (sysfs_streq(buf, "peripheral"))
 		new_mode_is_host = false;
 	else
 		return -EINVAL;

2.22.0