[REGRESSION J/bisected][PATCH 0/1] Fix Upstream stable v5.15.199

[Stefan Bader]

== Justification ==

Impact:
The upstream stable v5.15.199 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):

134d7f22da48 "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 v5.15 (bareudp.c/geneve.c).

Testcase:
Running the gre_gso.sh selftest with fail (timeout) without the fix.
After applying the test passes again.


Stefan Bader (1):
  UBUNTU: SAUCE: Fix skb_vlan_inet_prepare() usage

 net/ipv6/ip6_tunnel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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2.43.0