5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Guillaume Nault <gnault@xxxxxxxxxx>
[ Upstream commit c471236b2359e6b27388475dd04fff0a5e2bf922 ]
Both bareudp_xmit_skb() and bareudp6_xmit_skb() read their skb's inner
IP header to get its ECN value (with ip_tunnel_ecn_encap()). Therefore
we need to ensure that the inner IP header is part of the skb's linear
data.
Fixes: 571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
Signed-off-by: Guillaume Nault <gnault@xxxxxxxxxx>
Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Link: https://patch.msgid.link/267328222f0a11519c6de04c640a4f87a38ea9ed.1726046181.git.gnault@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/bareudp.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c
index 3fcd3b84a066e..bec8a2c8656c0 100644
--- a/drivers/net/bareudp.c
+++ b/drivers/net/bareudp.c
@@ -312,6 +312,9 @@ static int bareudp_xmit_skb(struct sk_buff *skb, struct net_device *dev,
__be32 saddr;
int err;
+ if (!skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB)))
+ return -EINVAL;
+
if (!sock)
return -ESHUTDOWN;
@@ -375,6 +378,9 @@ static int bareudp6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
__be16 sport;
int err;
+ if (!skb_vlan_inet_prepare(skb, skb->protocol != htons(ETH_P_TEB)))
+ return -EINVAL;
+
if (!sock)
return -ESHUTDOWN;
--
2.43.0
