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netfilter: nft_set_rbtree: skip sync GC for new elements in this transaction

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New elements in this transaction might expired before such transaction
ends. Skip sync GC for such elements otherwise commit path might walk
over an already released object. Once transaction is finished, async GC
will collect such expired element.

Fixes: f6c383b8c3 ("netfilter: nf_tables: adapt set backend to use GC transaction API")
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 2023-09-04 02:14:36 +02:00 committed by Florian Westphal
parent fdc04cc2d5
commit 2ee52ae94b
1 changed files with 6 additions and 2 deletions
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8
net/netfilter/nft_set_rbtree.c
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@ -312,6 +312,7 @@ static int __nft_rbtree_insert(const struct net *net, const struct nft_set *set,
struct nft_rbtree_elem *rbe, *rbe_le = NULL, *rbe_ge = NULL;
struct rb_node *node, *next, *parent, **p, *first = NULL;
struct nft_rbtree *priv = nft_set_priv(set);
u8 cur_genmask = nft_genmask_cur(net);
u8 genmask = nft_genmask_next(net);
int d, err;
@ -357,8 +358,11 @@ static int __nft_rbtree_insert(const struct net *net, const struct nft_set *set,
if (!nft_set_elem_active(&rbe->ext, genmask))
continue;
/* perform garbage collection to avoid bogus overlap reports. */
if (nft_set_elem_expired(&rbe->ext)) {
/* perform garbage collection to avoid bogus overlap reports
* but skip new elements in this transaction.
*/
if (nft_set_elem_expired(&rbe->ext) &&
nft_set_elem_active(&rbe->ext, cur_genmask)) {
err = nft_rbtree_gc_elem(set, priv, rbe, genmask);
if (err < 0)
return err;