[PATCH AUTOSEL 4.9 59/98] net: cdc_ncm: GetNtbFormat endian fix

From: Sasha Levin
Date: Thu Oct 25 2018 - 10:15:56 EST

From: BjÃrn Mork <bjorn@xxxxxxx>

[ Upstream commit 6314dab4b8fb8493d810e175cb340376052c69b6 ]

The GetNtbFormat and SetNtbFormat requests operate on 16 bit little
endian values. We get away with ignoring this most of the time, because
we only care about USB_CDC_NCM_NTB16_FORMAT which is 0x0000. This

Fix comparison between LE value from device and constant by converting
the constant to LE.

Reported-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Fixes: 2b02c20ce0c2 ("cdc_ncm: Set NTB format again after altsetting switch for Huawei devices")
Cc: Enrico Mioso <mrkiko.rs@xxxxxxxxx>
Cc: Christian Panton <christian@xxxxxxxxxx>
Signed-off-by: BjÃrn Mork <bjorn@xxxxxxx>
Acked-By: Enrico Mioso <mrkiko.rs@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/net/usb/cdc_ncm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 3086cae62fdc..7b158674ceed 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -772,7 +772,7 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
int err;
u8 iface_no;
struct usb_cdc_parsed_header hdr;
- u16 curr_ntb_format;
+ __le16 curr_ntb_format;

ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
@@ -890,7 +890,7 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
goto error2;

- if (curr_ntb_format == USB_CDC_NCM_NTB32_FORMAT) {
+ if (curr_ntb_format == cpu_to_le16(USB_CDC_NCM_NTB32_FORMAT)) {
dev_info(&intf->dev, "resetting NTB format to 16-bit");
err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,