netfilter: nf_tables: GC transaction race with abort path

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@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index d299e7aa1b9658e80c0b836a9d9cb3247f1758c9..a255456efae43d4dca4f9de8a5631c2406401b32 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -10337,8 +10337,12 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb,
                           enum nfnl_abort_action action)
 {
        struct nftables_pernet *nft_net = nft_pernet(net);
-       int ret = __nf_tables_abort(net, action);
+       unsigned int gc_seq;
+       int ret;
 
+       gc_seq = nft_gc_seq_begin(nft_net);
+       ret = __nf_tables_abort(net, action);
+       nft_gc_seq_end(nft_net, gc_seq);
        mutex_unlock(&nft_net->commit_mutex);
 
        return ret;