From 59f73e2ae185a6ab5c40f63657a83192bf054fb4 Mon Sep 17 00:00:00 2001 From: Amitkumar Karwar Date: Tue, 11 Jul 2017 19:57:52 +0530 Subject: [PATCH] rsi: check length before USB read/write register These checks are required. Otherwise we may end up getting memory corruption if invalid length is passed. Fixes: b97e9b94ad75c ("rsi: Add new host interface operations") Signed-off-by: Amitkumar Karwar Signed-off-by: Kalle Valo --- drivers/net/wireless/rsi/rsi_91x_usb.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/wireless/rsi/rsi_91x_usb.c b/drivers/net/wireless/rsi/rsi_91x_usb.c index 99a520afc7c5..3d33ce9ca2ba 100644 --- a/drivers/net/wireless/rsi/rsi_91x_usb.c +++ b/drivers/net/wireless/rsi/rsi_91x_usb.c @@ -166,6 +166,9 @@ static int rsi_usb_reg_read(struct usb_device *usbdev, if (!buf) return status; + if (len > RSI_USB_CTRL_BUF_SIZE) + return -EINVAL; + status = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), USB_VENDOR_REGISTER_READ, @@ -208,6 +211,9 @@ static int rsi_usb_reg_write(struct usb_device *usbdev, if (!usb_reg_buf) return status; + if (len > RSI_USB_CTRL_BUF_SIZE) + return -EINVAL; + usb_reg_buf[0] = (value & 0x00ff); usb_reg_buf[1] = (value & 0xff00) >> 8; usb_reg_buf[2] = 0x0;