* [PATCH net] net: lantiq_xrx200: fix use after free bug
@ 2022-03-05 11:20 Aleksander Jan Bajkowski
2022-03-05 15:41 ` Hauke Mehrtens
2022-03-07 11:40 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 3+ messages in thread
From: Aleksander Jan Bajkowski @ 2022-03-05 11:20 UTC (permalink / raw)
To: hauke, davem, kuba, olek2, netdev, linux-kernel; +Cc: Eric Dumazet
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: c3e6b2c35b34 ("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>
---
drivers/net/ethernet/lantiq_xrx200.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c
index 41d11137cde0..5712c3e94be8 100644
--- a/drivers/net/ethernet/lantiq_xrx200.c
+++ b/drivers/net/ethernet/lantiq_xrx200.c
@@ -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;
--
2.30.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net] net: lantiq_xrx200: fix use after free bug
2022-03-05 11:20 [PATCH net] net: lantiq_xrx200: fix use after free bug Aleksander Jan Bajkowski
@ 2022-03-05 15:41 ` Hauke Mehrtens
2022-03-07 11:40 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: Hauke Mehrtens @ 2022-03-05 15:41 UTC (permalink / raw)
To: Aleksander Jan Bajkowski, davem, kuba, netdev, linux-kernel; +Cc: Eric Dumazet
On 3/5/22 12:20, Aleksander Jan Bajkowski wrote:
> 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: c3e6b2c35b34 ("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>
> ---
> drivers/net/ethernet/lantiq_xrx200.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c
> index 41d11137cde0..5712c3e94be8 100644
> --- a/drivers/net/ethernet/lantiq_xrx200.c
> +++ b/drivers/net/ethernet/lantiq_xrx200.c
> @@ -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;
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net] net: lantiq_xrx200: fix use after free bug
2022-03-05 11:20 [PATCH net] net: lantiq_xrx200: fix use after free bug Aleksander Jan Bajkowski
2022-03-05 15:41 ` Hauke Mehrtens
@ 2022-03-07 11:40 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2022-03-07 11:40 UTC (permalink / raw)
To: Aleksander Jan Bajkowski
Cc: hauke, davem, kuba, netdev, linux-kernel, eric.dumazet
Hello:
This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:
On Sat, 5 Mar 2022 12:20:39 +0100 you wrote:
> 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: c3e6b2c35b34 ("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>
>
> [...]
Here is the summary with links:
- [net] net: lantiq_xrx200: fix use after free bug
https://git.kernel.org/netdev/net/c/dd830aed23c6
You are awesome, thank you!
--
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-03-05 11:20 [PATCH net] net: lantiq_xrx200: fix use after free bug Aleksander Jan Bajkowski
2022-03-05 15:41 ` Hauke Mehrtens
2022-03-07 11:40 ` patchwork-bot+netdevbpf
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