4.19-stable review patch. If anyone has any objections, please let me know.
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From: Pablo Neira Ayuso pablo@netfilter.org
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 --- 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);