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netfilter: nf_tables: GC transaction race with abort path

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

Fixes: 5f68718b34 ("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>
This commit is contained in:
Pablo Neira Ayuso 2023-08-18 01:13:52 +02:00 • committed by Florian Westphal
parent 2c9f029328
commit 720344340f
1 changed files with 5 additions and 1 deletions
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6
net/netfilter/nf_tables_api.c
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@ -10337,8 +10337,12 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb,
enum nfnl_abort_action action) enum nfnl_abort_action action)
{ {
struct nftables_pernet *nft_net = nft_pernet(net); 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); mutex_unlock(&nft_net->commit_mutex);
return ret; return ret;