netdev - [PATCH net] skbuff: Release nfct refcount on napi stolen or re-used skbs

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Date:   Tue, 25 May 2021 12:13:22 +0300
From:   Paul Blakey <paulb@...dia.com>
To:     Paul Blakey <paulb@...dia.com>, <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        "Saeed Mahameed" <saeedm@...dia.com>, Oz Shlomo <ozsh@...dia.com>,
        Roi Dayan <roid@...dia.com>, Vlad Buslov <vladbu@...dia.com>
Subject: [PATCH net] skbuff: Release nfct refcount on napi stolen or re-used skbs

When multiple SKBs are merged to a new skb under napi GRO,
or SKB is re-used by napi, if nfct was set for them in the
driver, it will not be released while freeing their stolen
head state or on re-use.

Release nfct on napi's stolen or re-used SKBs.

Fixes: 5c6b94604744 ("net/mlx5e: CT: Handle misses after executing CT action")
Reviewed-by: Roi Dayan <roid@...dia.com>
Signed-off-by: Paul Blakey <paulb@...dia.com>
---
 net/core/dev.c    | 1 +
 net/core/skbuff.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index ef8cf7619baf..a5324ca7dc65 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6243,6 +6243,7 @@ static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
 	skb_shinfo(skb)->gso_type = 0;
 	skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
 	skb_ext_reset(skb);
+	nf_reset_ct(skb);
 
 	napi->skb = skb;
 }
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 3ad22870298c..6127bab2fe2f 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -939,6 +939,7 @@ void __kfree_skb_defer(struct sk_buff *skb)
 
 void napi_skb_free_stolen_head(struct sk_buff *skb)
 {
+	nf_conntrack_put(skb_nfct(skb));
 	skb_dst_drop(skb);
 	skb_ext_put(skb);
 	napi_skb_cache_put(skb);
-- 
2.30.1