ACK/Cmnt: [REGRESSION][N][PATCH 0/1] Fix Upstream stable v6.6.122, v6.12.67, v6.12.68

[Manuel Diewald]

On Wed, Apr 15, 2026 at 12:40:13PM +0300, Mehmet Basaran wrote:
> == Justification ==
> 
> Impact:
> The upstream stable v6.6.122, v6.12.67, v6.12.68 update included a 
> change to __ip6_tnl_rcv() which does not work for kernels <v6.13 
> (this might be important if the following is ever picked):
> 
> f842901be344 "ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()"
> 
> Above patch replaces pskb_inet_may_pull() with skb_vlan_inet_prepare().
> The problem is that around v6.13 there was
> 
> "net: tunnel: make skb_vlan_inet_prepare() return drop reasons"
> 
> which changes return values of skb_vlan_inet_prepare(). Before a non
> zero return code meant success while after it is the opposite.
> 
> Fix:
> Instead of pulling another dependency the proposed fix changes usage to
> other callers of skb_vlan_inet_prepare() in v6.8 
> (bareudp.c/geneve.c/vxlan_core.c).
> 
> Testcase:
> Running the ubuntu_kselftests_net:net:l2_tos_ttl_inherit.sh fail (timeout)
> without the fix. After applying the test passes again.
> 
> Mehmet Basaran (1):
>   UBUNTU: SAUCE: Fix skb_vlan_inet_prepare() usage
> 
>  net/ipv6/ip6_tunnel.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> -- 
> 2.43.0
> 
> 
> -- 
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team

I think we should probably submit this to upstream, too.

Acked-by: Manuel Diewald <manuel.diewald at canonical.com>

-- 
 Manuel
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