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rsi: check length before USB read/write register

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These checks are required. Otherwise we may end up getting
memory corruption if invalid length is passed.

Fixes: b97e9b94ad ("rsi: Add new host interface operations")
Signed-off-by: Amitkumar Karwar <amit.karwar@redpinesignals.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Amitkumar Karwar 2017-07-11 19:57:52 +05:30 committed by Kalle Valo
parent 523b724a76
commit 59f73e2ae1
1 changed files with 6 additions and 0 deletions
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6
drivers/net/wireless/rsi/rsi_91x_usb.c
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@ -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;