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net: usb: ax88179_178a: stop lying about skb->truesize
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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 1e2c611 ("net: cdc_ncm: reduce skb truesize
in rx path")

Fixes: f8ebb3a ("net: usb: ax88179_178a: Fix packet receiving")
Reported-by: shironeko <shironeko@tesaguri.club>
Closes: https://lore.kernel.org/netdev/c110f41a0d2776b525930f213ca9715c@tesaguri.club/
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jose Alonso <joalonsof@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240421193828.1966195-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Eric Dumazet authored and kuba-moo committed Apr 24, 2024
1 parent 58a4c9b commit 4ce62d5
Showing 1 changed file with 3 additions and 8 deletions.
11 changes: 3 additions & 8 deletions drivers/net/usb/ax88179_178a.c
Original file line number Diff line number Diff line change
Expand Up @@ -1456,21 +1456,16 @@ 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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