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netfilter: nf_tables: GC transaction race with abort path

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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@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso 2023-11-21 13:13:21 +01:00 • committed by Greg Kroah-Hartman
commit 4b6346dc1e
1 changed files with 6 additions and 1 deletions
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7
net/netfilter/nf_tables_api.c
View file

@ -7597,7 +7597,12 @@ static int nf_tables_abort(struct net *net, struct sk_buff *skb,
enum nfnl_abort_action action)
{
struct nftables_pernet *nft_net = net_generic(net, nf_tables_net_id);
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);