The expired catchall element is not deactivated and removed from GC sync path. This path holds mutex so just call nft_setelem_data_deactivate() and nft_setelem_catchall_remove() before queueing the GC work. Fixes: 4a9e12ea7e70 ("netfilter: nft_set_pipapo: call nft_trans_gc_queue_sync() in catchall GC") Reported-by: lonial con <kongln9170@xxxxxxxxx> Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> --- net/netfilter/nf_tables_api.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 146b7447a969..a761ee6796f6 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -6520,6 +6520,12 @@ static int nft_setelem_deactivate(const struct net *net, return ret; } +static void nft_setelem_catchall_destroy(struct nft_set_elem_catchall *catchall) +{ + list_del_rcu(&catchall->list); + kfree_rcu(catchall, rcu); +} + static void nft_setelem_catchall_remove(const struct net *net, const struct nft_set *set, struct nft_elem_priv *elem_priv) @@ -6528,8 +6534,7 @@ static void nft_setelem_catchall_remove(const struct net *net, list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { if (catchall->elem == elem_priv) { - list_del_rcu(&catchall->list); - kfree_rcu(catchall, rcu); + nft_setelem_catchall_destroy(catchall); break; } } @@ -9678,11 +9683,12 @@ static struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc, unsigned int gc_seq, bool sync) { - struct nft_set_elem_catchall *catchall; + struct nft_set_elem_catchall *catchall, *next; const struct nft_set *set = gc->set; + struct nft_elem_priv *elem_priv; struct nft_set_ext *ext; - list_for_each_entry_rcu(catchall, &set->catchall_list, list) { + list_for_each_entry_safe(catchall, next, &set->catchall_list, list) { ext = nft_set_elem_ext(set, catchall->elem); if (!nft_set_elem_expired(ext)) @@ -9700,7 +9706,13 @@ static struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc, if (!gc) return NULL; - nft_trans_gc_elem_add(gc, catchall->elem); + elem_priv = catchall->elem; + if (sync) { + nft_setelem_data_deactivate(gc->net, gc->set, elem_priv); + nft_setelem_catchall_destroy(catchall); + } + + nft_trans_gc_elem_add(gc, elem_priv); } return gc; -- 2.30.2