This is a note to let you know that I've just added the patch titled
net: ipv6: fix dst ref loop in ila lwtunnel
to the 6.12-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:
net-ipv6-fix-dst-ref-loop-in-ila-lwtunnel.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 677613854ff4621e079fc55cb3739d9100d5d48a
Author: Justin Iurman <justin.iurman@xxxxxxxxx>
Date: Tue Mar 4 19:10:39 2025 +0100
net: ipv6: fix dst ref loop in ila lwtunnel
[ Upstream commit 0e7633d7b95b67f1758aea19f8e85621c5f506a3 ]
This patch follows commit 92191dd10730 ("net: ipv6: fix dst ref loops in
rpl, seg6 and ioam6 lwtunnels") and, on a second thought, the same patch
is also needed for ila (even though the config that triggered the issue
was pathological, but still, we don't want that to happen).
Fixes: 79ff2fc31e0f ("ila: Cache a route to translated address")
Cc: Tom Herbert <tom@xxxxxxxxxxxxxxx>
Signed-off-by: Justin Iurman <justin.iurman@xxxxxxxxx>
Link: https://patch.msgid.link/20250304181039.35951-1-justin.iurman@xxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c
index ff7e734e335b0..ac4bcc623603a 100644
--- a/net/ipv6/ila/ila_lwt.c
+++ b/net/ipv6/ila/ila_lwt.c
@@ -88,7 +88,8 @@ static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
goto drop;
}
- if (ilwt->connected) {
+ /* cache only if we don't create a dst reference loop */
+ if (ilwt->connected && orig_dst->lwtstate != dst->lwtstate) {
local_bh_disable();
dst_cache_set_ip6(&ilwt->dst_cache, dst, &fl6.saddr);
local_bh_enable();
