[PATCH net-next v5 02/12] net: mctp: usb: Use packet-length max for maximum packet-size check

[Jeremy Kerr <jk@codeconstruct.com.au>]

The max packet size is smaller than the max transfer size, as we only
have a u8 length field in the transport header.

Add a define for the maximum representable length, and use that for our
check. Use this for the MTU maximum calculation too.

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
---
 drivers/net/mctp/mctp-usb.c  | 2 +-
 include/linux/usb/mctp-usb.h | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mctp/mctp-usb.c b/drivers/net/mctp/mctp-usb.c
index 545eff06322c..c6e36b63e87a 100644
--- a/drivers/net/mctp/mctp-usb.c
+++ b/drivers/net/mctp/mctp-usb.c
@@ -76,7 +76,7 @@ static netdev_tx_t mctp_usb_start_xmit(struct sk_buff *skb,
 
 	plen = skb->len;
 
-	if (plen + sizeof(*hdr) > MCTP_USB_1_0_XFER_SIZE)
+	if (plen + sizeof(*hdr) > MCTP_USB_1_0_PKTLEN_MAX)
 		goto err_drop;
 
 	rc = skb_cow_head(skb, sizeof(*hdr));
diff --git a/include/linux/usb/mctp-usb.h b/include/linux/usb/mctp-usb.h
index 47e2e3931d63..2bece8afd1c7 100644
--- a/include/linux/usb/mctp-usb.h
+++ b/include/linux/usb/mctp-usb.h
@@ -25,7 +25,8 @@ struct mctp_usb_hdr {
 #define MCTP_USB_1_0_XFER_SIZE	512
 #define MCTP_USB_BTU		68
 #define MCTP_USB_MTU_MIN	MCTP_USB_BTU
-#define MCTP_USB_1_0_MTU_MAX	(U8_MAX - sizeof(struct mctp_usb_hdr))
+#define MCTP_USB_1_0_PKTLEN_MAX	U8_MAX
+#define MCTP_USB_1_0_MTU_MAX	(MCTP_USB_1_0_PKTLEN_MAX - sizeof(struct mctp_usb_hdr))
 #define MCTP_USB_DMTF_ID	0x1ab4
 
 #endif /*  __LINUX_USB_MCTP_USB_H */

-- 
2.47.3