This is a note to let you know that I've just added the patch titled
net: mctp: copy skb ext data when fragmenting
to the 6.1-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-mctp-copy-skb-ext-data-when-fragmenting.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a4ba1fed5ddceecd0c90466705f0eea4dde603c0
Author: Jeremy Kerr <jk@xxxxxxxxxxxxxxxxxxxx>
Date: Mon Feb 19 17:51:54 2024 +0800
net: mctp: copy skb ext data when fragmenting
[ Upstream commit 1394c1dec1c619a46867ed32791a29695372bff8 ]
If we're fragmenting on local output, the original packet may contain
ext data for the MCTP flows. We'll want this in the resulting fragment
skbs too.
So, do a skb_ext_copy() in the fragmentation path, and implement the
MCTP-specific parts of an ext copy operation.
Fixes: 67737c457281 ("mctp: Pass flow data & flow release events to drivers")
Reported-by: Jian Zhang <zhangjian.3032@xxxxxxxxxxxxx>
Signed-off-by: Jeremy Kerr <jk@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index d4bd10f8723df..e38a4c7449f62 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -6500,6 +6500,14 @@ static struct skb_ext *skb_ext_maybe_cow(struct skb_ext *old,
for (i = 0; i < sp->len; i++)
xfrm_state_hold(sp->xvec[i]);
}
+#endif
+#ifdef CONFIG_MCTP_FLOWS
+ if (old_active & (1 << SKB_EXT_MCTP)) {
+ struct mctp_flow *flow = skb_ext_get_ptr(old, SKB_EXT_MCTP);
+
+ if (flow->key)
+ refcount_inc(&flow->key->refs);
+ }
#endif
__skb_ext_put(old);
return new;
diff --git a/net/mctp/route.c b/net/mctp/route.c
index 0144d8ebdaefb..05ab4fddc82e9 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -843,6 +843,9 @@ static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,
/* copy message payload */
skb_copy_bits(skb, pos, skb_transport_header(skb2), size);
+ /* we need to copy the extensions, for MCTP flow data */
+ skb_ext_copy(skb2, skb);
+
/* do route */
rc = rt->output(rt, skb2);
if (rc)
