Patch "net: usb: ax88179_178a: stop lying about skb->truesize" has been added to the 5.4-stable tree

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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 5.4-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-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c0e1c0368496f51611578e2682dd6c4fd37f9fd4
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 84dc9fb2b1f3f..c6159b521e063 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1452,21 +1452,16 @@ 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);
 




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