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

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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().

Fixes: cc995c9ec118 ("usb: gadget: udc: renesas_usb3: add support for usb role swap")
Cc: <stable@vger.kernel.org> # v4.12+
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Yoshihiro Shimoda 2019-07-31 19:15:43 +09:00 committed by Felipe Balbi
parent d45331b00d
commit 5dac665cf4
1 changed files with 3 additions and 2 deletions
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5
drivers/usb/gadget/udc/renesas_usb3.c
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@ -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;