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 60c0c230c6f046da536d3df8b39a20b9a9fd6af0 upstream.
rbtree lazy gc on insert might collect an end interval element that has been just added in this transactions, skip end interval elements that are not yet active.
Fixes: f718863aca46 ("netfilter: nft_set_rbtree: fix overlap expiration walk") Cc: stable@vger.kernel.org Reported-by: lonial con kongln9170@gmail.com Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/netfilter/nft_set_rbtree.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-)
--- a/net/netfilter/nft_set_rbtree.c +++ b/net/netfilter/nft_set_rbtree.c @@ -240,8 +240,7 @@ static void nft_rbtree_gc_remove(struct
static int nft_rbtree_gc_elem(const struct nft_set *__set, struct nft_rbtree *priv, - struct nft_rbtree_elem *rbe, - u8 genmask) + struct nft_rbtree_elem *rbe) { struct nft_set *set = (struct nft_set *)__set; struct rb_node *prev = rb_prev(&rbe->node); @@ -260,7 +259,7 @@ static int nft_rbtree_gc_elem(const stru while (prev) { rbe_prev = rb_entry(prev, struct nft_rbtree_elem, node); if (nft_rbtree_interval_end(rbe_prev) && - nft_set_elem_active(&rbe_prev->ext, genmask)) + nft_set_elem_active(&rbe_prev->ext, NFT_GENMASK_ANY)) break;
prev = rb_prev(prev); @@ -368,7 +367,7 @@ static int __nft_rbtree_insert(const str */ if (nft_set_elem_expired(&rbe->ext) && nft_set_elem_active(&rbe->ext, cur_genmask)) { - err = nft_rbtree_gc_elem(set, priv, rbe, genmask); + err = nft_rbtree_gc_elem(set, priv, rbe); if (err < 0) return err;