From: Asbjørn Sloth Tønnesen <ast@fiberby.net> stable inclusion from stable-v6.6.152 commit f236d51f9caf26cd77d8444780320540f43750dd category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/18291 CVE: CVE-2026-74700 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 2081fd3445fec6b9813c20e8b910c2abd6de31cb ] Maintain a count of filters per block. Counter updates are protected by cb_lock, which is also used to protect the offload counters. Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net> Reviewed-by: Simon Horman <horms@kernel.org> Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Stable-dep-of: a347304b2ca1 ("net/sched: cls_api: Always acquire rtnl_lock when destroying locked classifiers") Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Li Xiasong <lixiasong1@huawei.com> Signed-off-by: Dong Chenchen <dongchenchen2@huawei.com> --- include/net/sch_generic.h | 2 ++ net/sched/cls_api.c | 19 +++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index 29382cd4a346..547d7d82c06a 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -439,6 +439,7 @@ struct tcf_proto { */ spinlock_t lock; bool deleting; + bool counted; refcount_t refcnt; struct rcu_head rcu; struct hlist_node destroy_ht_node; @@ -487,6 +488,7 @@ struct tcf_block { struct flow_block flow_block; struct list_head owner_list; bool keep_dst; + atomic_t filtercnt; /* Number of filters */ atomic_t skipswcnt; /* Number of skip_sw filters */ atomic_t offloadcnt; /* Number of oddloaded filters */ unsigned int nooffloaddevcnt; /* Number of devs unable to do offload */ diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 792e7040ebc1..d25ac6025971 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -410,12 +410,30 @@ static void tcf_proto_get(struct tcf_proto *tp) refcount_inc(&tp->refcnt); } +static void tcf_block_filter_cnt_update(struct tcf_block *block, bool *counted, bool add) +{ + lockdep_assert_not_held(&block->cb_lock); + + down_write(&block->cb_lock); + if (*counted != add) { + if (add) { + atomic_inc(&block->filtercnt); + *counted = true; + } else { + atomic_dec(&block->filtercnt); + *counted = false; + } + } + up_write(&block->cb_lock); +} + static void tcf_chain_put(struct tcf_chain *chain); static void tcf_proto_destroy(struct tcf_proto *tp, bool rtnl_held, bool sig_destroy, struct netlink_ext_ack *extack) { tp->ops->destroy(tp, rtnl_held, extack); + tcf_block_filter_cnt_update(tp->chain->block, &tp->counted, false); if (sig_destroy) tcf_proto_signal_destroyed(tp->chain, tp); tcf_chain_put(tp->chain); @@ -2354,6 +2372,7 @@ static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n, err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh, flags, extack); if (err == 0) { + tcf_block_filter_cnt_update(block, &tp->counted, true); tfilter_notify(net, skb, n, tp, block, q, parent, fh, RTM_NEWTFILTER, false, rtnl_held, extack); tfilter_put(tp, fh); -- 2.25.1