This is a note to let you know that I've just added the patch titled
net: usb: ax88179_178a: stop lying about skb->truesize
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-usb-ax88179_178a-stop-lying-about-skb-truesize.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit d989a4c7177b251691d58bc86ead693b7bf03545
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Sun Apr 21 19:38:28 2024 +0000
net: usb: ax88179_178a: stop lying about skb->truesize
[ Upstream commit 4ce62d5b2f7aecd4900e7d6115588ad7f9acccca ]
Some usb drivers try to set small skb->truesize and break
core networking stacks.
In this patch, I removed one of the skb->truesize overide.
I also replaced one skb_clone() by an allocation of a fresh
and small skb, to get minimally sized skbs, like we did
in commit 1e2c61172342 ("net: cdc_ncm: reduce skb truesize
in rx path")
Fixes: f8ebb3ac881b ("net: usb: ax88179_178a: Fix packet receiving")
Reported-by: shironeko <shironeko@xxxxxxxxxxxxx>
Closes: https://lore.kernel.org/netdev/c110f41a0d2776b525930f213ca9715c@xxxxxxxxxxxxx/
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Jose Alonso <joalonsof@xxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240421193828.1966195-1-edumazet@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index 3df203feb09c5..812361e832fd5 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1465,21 +1465,16 @@ static int ax88179_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
/* Skip IP alignment pseudo header */
skb_pull(skb, 2);
- skb->truesize = SKB_TRUESIZE(pkt_len_plus_padd);
ax88179_rx_checksum(skb, pkt_hdr);
return 1;
}
- ax_skb = skb_clone(skb, GFP_ATOMIC);
+ ax_skb = netdev_alloc_skb_ip_align(dev->net, pkt_len);
if (!ax_skb)
return 0;
- skb_trim(ax_skb, pkt_len);
+ skb_put(ax_skb, pkt_len);
+ memcpy(ax_skb->data, skb->data + 2, pkt_len);
- /* Skip IP alignment pseudo header */
- skb_pull(ax_skb, 2);
-
- skb->truesize = pkt_len_plus_padd +
- SKB_DATA_ALIGN(sizeof(struct sk_buff));
ax88179_rx_checksum(ax_skb, pkt_hdr);
usbnet_skb_return(dev, ax_skb);
