ipheth: Properly distinguish length and alignment in URBs and skbs (9c412942) · Commits · 戴 / test

The USB protocol this driver implements appears to require 2 bytes of padding in front of each received packet. This used to be equal to the value of NET_IP_ALIGN on x86, so the driver abused that constant and mostly worked, but this is no longer the case. The driver also mixed up the URB and packet lengths, resulting in 2 bytes of junk at the end of the skb. Introduce a private constant for the 2 bytes of padding; fix this confusion and check for the under-length case. Signed-off-by:

Ben Hutchings <bhutchings@solarflare.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

drivers/net/usb/ipheth.c

+9 −5

Original line number	Diff line number	Diff line
		@@ -65,6 +65,7 @@
		#define IPHETH_USBINTF_PROTO 1

		#define IPHETH_BUF_SIZE 1516
		#define IPHETH_IP_ALIGN 2 /* padding at front of URB */
		#define IPHETH_TX_TIMEOUT (5 * HZ)

		#define IPHETH_INTFNUM 2
		@@ -202,18 +203,21 @@ static void ipheth_rcvbulk_callback(struct urb *urb)
		return;
		}

		len = urb->actual_length;
		buf = urb->transfer_buffer;
		if (urb->actual_length <= IPHETH_IP_ALIGN) {
		dev->net->stats.rx_length_errors++;
		return;
		}
		len = urb->actual_length - IPHETH_IP_ALIGN;
		buf = urb->transfer_buffer + IPHETH_IP_ALIGN;

		skb = dev_alloc_skb(NET_IP_ALIGN + len);
		skb = dev_alloc_skb(len);
		if (!skb) {
		err("%s: dev_alloc_skb: -ENOMEM", __func__);
		dev->net->stats.rx_dropped++;
		return;
		}

		skb_reserve(skb, NET_IP_ALIGN);
		memcpy(skb_put(skb, len), buf + NET_IP_ALIGN, len - NET_IP_ALIGN);
		memcpy(skb_put(skb, len), buf, len);
		skb->dev = dev->net;
		skb->protocol = eth_type_trans(skb, dev->net);

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