net: usb: rtl8150: Fix frame padding

commit 75cea9860aa6b2350d90a8d78fed114d27c7eca2 upstream.

TX frames aren't padded and unknown memory is sent into the ether.

Theoretically, it isn't even guaranteed that the extra memory exists
and can be sent out, which could cause further problems. In practice,
I found that plenty of tailroom exists in the skb itself (in my test
with ping at least) and skb_padto() easily succeeds, so use it here.

In the event of -ENOMEM drop the frame like other drivers do.

The use of one more padding byte instead of a USB zero-length packet
is retained to avoid regression. I have a dodgy Etron xHCI controller
which doesn't seem to support sending ZLPs at all.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Michal Pecio <michal.pecio@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20251014203528.3f9783c4.michal.pecio@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
index 1df289e7c1304d76c182251197306f0a989cabde..e4cca92aa4a866ea6b7e4a02ff219039a7509ef2 100644 (file)
--- a/drivers/net/usb/rtl8150.c
+++ b/drivers/net/usb/rtl8150.c
@@ -705,9 +705,16 @@ static netdev_tx_t rtl8150_start_xmit(struct sk_buff *skb,
        rtl8150_t *dev = netdev_priv(netdev);
        int count, res;
 
+       /* pad the frame and ensure terminating USB packet, datasheet 9.2.3 */
+       count = max(skb->len, ETH_ZLEN);
+       if (count % 64 == 0)
+               count++;
+       if (skb_padto(skb, count)) {
+               netdev->stats.tx_dropped++;
+               return NETDEV_TX_OK;
+       }
+
        netif_stop_queue(netdev);
-       count = (skb->len < 60) ? 60 : skb->len;
-       count = (count & 0x3f) ? count : count + 1;
        dev->tx_skb = skb;
        usb_fill_bulk_urb(dev->tx_urb, dev->udev, usb_sndbulkpipe(dev->udev, 2),
                      skb->data, count, write_bulk_callback, dev);