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net: lantiq_xrx200: fix use after free bug

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The skb->len field is read after the packet is sent to the network
stack. In the meantime, skb can be freed. This patch fixes this bug.

Fixes: c3e6b2c35b ("net: lantiq_xrx200: add ingress SG DMA support")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aleksander Jan Bajkowski 2022-03-05 12:20:39 +01:00 committed by David S. Miller
parent e0058f0fa8
commit dd830aed23
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/lantiq_xrx200.c
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@ -260,9 +260,9 @@ static int xrx200_hw_receive(struct xrx200_chan *ch)
if (ctl & LTQ_DMA_EOP) {
ch->skb_head->protocol = eth_type_trans(ch->skb_head, net_dev);
netif_receive_skb(ch->skb_head);
net_dev->stats.rx_packets++;
net_dev->stats.rx_bytes += ch->skb_head->len;
netif_receive_skb(ch->skb_head);
ch->skb_head = NULL;
ch->skb_tail = NULL;
ret = XRX200_DMA_PACKET_COMPLETE;