| Message ID | 20240421193828.1966195-1-edumazet@google.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 4ce62d5b2f7aecd4900e7d6115588ad7f9acccca |
| Headers | show |
| Series | [net] net: usb: ax88179_178a: stop lying about skb->truesize | expand |
On Sun, Apr 21, 2024 at 07:38:28PM +0000, Eric Dumazet wrote: > 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@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> > Cc: linux-usb@vger.kernel.org Reviewed-by: Simon Horman <horms@kernel.org>
Hello: This patch was applied to netdev/net.git (main) by Jakub Kicinski <kuba@kernel.org>: On Sun, 21 Apr 2024 19:38:28 +0000 you wrote: > 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") > > [...] Here is the summary with links: - [net] net: usb: ax88179_178a: stop lying about skb->truesize https://git.kernel.org/netdev/net/c/4ce62d5b2f7a You are awesome, thank you!
diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c index 752f821a19901f313a1aca51fe332539ce82385b..df9d767cb524241848c744504d6e2999efc42ed5 100644 --- a/drivers/net/usb/ax88179_178a.c +++ b/drivers/net/usb/ax88179_178a.c @@ -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);
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@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> Cc: linux-usb@vger.kernel.org --- drivers/net/usb/ax88179_178a.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-)