The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 0a88fa221ce911c331bf700d2214c5b2f77414d3 Mon Sep 17 00:00:00 2001

From: Manish Narani manish.narani@xilinx.com Date: Tue, 17 Nov 2020 12:43:35 +0530 Subject: [PATCH] usb: gadget: u_ether: Fix MTU size mismatch with RX packet size

Fix the MTU size issue with RX packet size as the host sends the packet with extra bytes containing ethernet header. This causes failure when user sets the MTU size to the maximum i.e. 15412. In this case the ethernet packet received will be of length 15412 plus the ethernet header length. This patch fixes the issue where there is a check that RX packet length must not be more than max packet length.

Fixes: bba787a860fa ("usb: gadget: ether: Allow jumbo frames") Signed-off-by: Manish Narani manish.narani@xilinx.com Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/1605597215-122027-1-git-send-email-manish.narani@x... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c index 31ea76adcc0d..c019f2b0c0af 100644 --- a/drivers/usb/gadget/function/u_ether.c +++ b/drivers/usb/gadget/function/u_ether.c @@ -45,9 +45,10 @@ #define UETH__VERSION "29-May-2008"

/* Experiments show that both Linux and Windows hosts allow up to 16k - * frame sizes. Set the max size to 15k+52 to prevent allocating 32k + * frame sizes. Set the max MTU size to 15k+52 to prevent allocating 32k * blocks and still have efficient handling. */ -#define GETHER_MAX_ETH_FRAME_LEN 15412 +#define GETHER_MAX_MTU_SIZE 15412 +#define GETHER_MAX_ETH_FRAME_LEN (GETHER_MAX_MTU_SIZE + ETH_HLEN)

struct eth_dev { /* lock is held while accessing port_usb @@ -786,7 +787,7 @@ struct eth_dev *gether_setup_name(struct usb_gadget *g,

/* MTU range: 14 - 15412 */ net->min_mtu = ETH_HLEN; - net->max_mtu = GETHER_MAX_ETH_FRAME_LEN; + net->max_mtu = GETHER_MAX_MTU_SIZE;

dev->gadget = g; SET_NETDEV_DEV(net, &g->dev); @@ -848,7 +849,7 @@ struct net_device *gether_setup_name_default(const char *netname)

/* MTU range: 14 - 15412 */ net->min_mtu = ETH_HLEN; - net->max_mtu = GETHER_MAX_ETH_FRAME_LEN; + net->max_mtu = GETHER_MAX_MTU_SIZE;

return net; }