[PATCH 4.19 173/213] netfilter: nf_tables: GC transaction race with abort path

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>

commit 720344340fb9be2765bbaab7b292ece0a4570eae upstream.

Abort path is missing a synchronization point with GC transactions. Add
GC sequence number hence any GC transaction losing race will be
discarded.

Fixes: 5f68718b34a5 ("netfilter: nf_tables: GC transaction API to avoid race with control plane")
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/netfilter/nf_tables_api.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -7263,7 +7263,12 @@ static int __nf_tables_abort(struct net
 static int nf_tables_abort(struct net *net, struct sk_buff *skb)
 {
 	struct nftables_pernet *nft_net = net_generic(net, nf_tables_net_id);
-	int ret = __nf_tables_abort(net);
+	unsigned int gc_seq;
+	int ret;
+
+	gc_seq = nft_gc_seq_begin(nft_net);
+	ret = __nf_tables_abort(net);
+	nft_gc_seq_end(nft_net, gc_seq);
 
 	mutex_unlock(&nft_net->commit_mutex);
 






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