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amt: do not use amt->nr_tunnels outside of lock

Browse source 
amt->nr_tunnels is protected by amt->lock.
But, amt_request_handler() has been using this variable without the
amt->lock.
So, it expands context of amt->lock in the amt_request_handler() to
protect amt->nr_tunnels variable.

Fixes: cbc21dc1cf ("amt: add data plane of amt interface")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Taehee Yoo 2022-07-17 16:09:10 +00:00 committed by Paolo Abeni
parent e882827d5b
commit 989918482b
1 changed files with 6 additions and 3 deletions
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9
drivers/net/amt.c
View file

@ -2679,7 +2679,9 @@ static bool amt_request_handler(struct amt_dev *amt, struct sk_buff *skb)
if (tunnel->ip4 == iph->saddr)
goto send;
spin_lock_bh(&amt->lock);
if (amt->nr_tunnels >= amt->max_tunnels) {
spin_unlock_bh(&amt->lock);
icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
return true;
}
@ -2687,8 +2689,10 @@ static bool amt_request_handler(struct amt_dev *amt, struct sk_buff *skb)
tunnel = kzalloc(sizeof(*tunnel) +
(sizeof(struct hlist_head) * amt->hash_buckets),
GFP_ATOMIC);
if (!tunnel)
if (!tunnel) {
spin_unlock_bh(&amt->lock);
return true;
}
tunnel->source_port = udph->source;
tunnel->ip4 = iph->saddr;
@ -2701,10 +2705,9 @@ static bool amt_request_handler(struct amt_dev *amt, struct sk_buff *skb)
INIT_DELAYED_WORK(&tunnel->gc_wq, amt_tunnel_expire);
spin_lock_bh(&amt->lock);
list_add_tail_rcu(&tunnel->list, &amt->tunnel_list);
tunnel->key = amt->key;
amt_update_relay_status(tunnel, AMT_STATUS_RECEIVED_REQUEST, true);
__amt_update_relay_status(tunnel, AMT_STATUS_RECEIVED_REQUEST, true);
amt->nr_tunnels++;
mod_delayed_work(amt_wq, &tunnel->gc_wq,
msecs_to_jiffies(amt_gmi(amt)));