From: Bjørn Mork <[email protected]> commit 6314dab4b8fb8493d810e175cb340376052c69b6 upstream.
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 fails for USB_CDC_NCM_NTB32_FORMAT. Fix comparison between LE value from device and constant by converting the constant to LE. Reported-by: Ben Hutchings <[email protected]> Fixes: 2b02c20ce0c2 ("cdc_ncm: Set NTB format again after altsetting switch for Huawei devices") Cc: Enrico Mioso <[email protected]> Cc: Christian Panton <[email protected]> Signed-off-by: Bjørn Mork <[email protected]> Acked-By: Enrico Mioso <[email protected]> Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Nobuhiro Iwamatsu <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/net/usb/cdc_ncm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -727,7 +727,7 @@ int cdc_ncm_bind_common(struct usbnet *d 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) @@ -841,7 +841,7 @@ int cdc_ncm_bind_common(struct usbnet *d 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, USB_TYPE_CLASS | USB_DIR_OUT
