This is a note to let you know that I've just added the patch titled
vrf: Reset IPCB/IP6CB when processing outbound pkts in vrf dev xmit
to the 4.9-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:
vrf-reset-ipcb-ip6cb-when-processing-outbound-pkts-in-vrf-dev-xmit.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ee201011c1e1563c114a55c86eb164b236f18e84 Mon Sep 17 00:00:00 2001
From: Stephen Suryaputra <ssuryaextr@xxxxxxxxx>
Date: Tue, 30 Nov 2021 11:26:37 -0500
Subject: vrf: Reset IPCB/IP6CB when processing outbound pkts in vrf dev xmit
From: Stephen Suryaputra <ssuryaextr@xxxxxxxxx>
commit ee201011c1e1563c114a55c86eb164b236f18e84 upstream.
IPCB/IP6CB need to be initialized when processing outbound v4 or v6 pkts
in the codepath of vrf device xmit function so that leftover garbage
doesn't cause futher code that uses the CB to incorrectly process the
pkt.
One occasion of the issue might occur when MPLS route uses the vrf
device as the outgoing device such as when the route is added using "ip
-f mpls route add <label> dev <vrf>" command.
The problems seems to exist since day one. Hence I put the day one
commits on the Fixes tags.
Fixes: 193125dbd8eb ("net: Introduce VRF device driver")
Fixes: 35402e313663 ("net: Add IPv6 support to VRF device")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Stephen Suryaputra <ssuryaextr@xxxxxxxxx>
Reviewed-by: David Ahern <dsahern@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211130162637.3249-1-ssuryaextr@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/vrf.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -226,6 +226,7 @@ static netdev_tx_t vrf_process_v6_outbou
/* strip the ethernet header added for pass through VRF device */
__skb_pull(skb, skb_network_offset(skb));
+ memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
ret = vrf_ip6_local_out(net, skb->sk, skb);
if (unlikely(net_xmit_eval(ret)))
dev->stats.tx_errors++;
@@ -332,6 +333,7 @@ static netdev_tx_t vrf_process_v4_outbou
RT_SCOPE_LINK);
}
+ memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
ret = vrf_ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
if (unlikely(net_xmit_eval(ret)))
vrf_dev->stats.tx_errors++;
Patches currently in stable-queue which might be from ssuryaextr@xxxxxxxxx are
queue-4.9/vrf-reset-ipcb-ip6cb-when-processing-outbound-pkts-in-vrf-dev-xmit.patch
