From: Marc Kleine-Budde <mkl@pengutronix.de> mainline inclusion from mainline-v5.4-rc1 commit bdfb5765e45b86b599caf377a99826409f8403cb category: feature bugzilla: 38684 CVE: NA --------------------------- Since using the "struct can_ml_priv" for the per device "struct dev_rcv_lists" the call can_dev_rcv_lists_find() cannot fail anymore. This patch simplifies af_can by removing the NULL pointer checks from the dev_rcv_lists returned by can_dev_rcv_lists_find(). Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Acked-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Conflicts: net/can/af_can.c Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com> Reviewed-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- net/can/af_can.c | 46 ++++++++++++++++------------------------------ 1 file changed, 16 insertions(+), 30 deletions(-) diff --git a/net/can/af_can.c b/net/can/af_can.c index c2baf6444f5c..99496b9adfd2 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -487,28 +487,22 @@ int can_rx_register(struct net *net, struct net_device *dev, canid_t can_id, spin_lock(&net->can.can_rcvlists_lock); dev_rcv_lists = can_dev_rcv_lists_find(net, dev); - if (dev_rcv_lists) { - rcv_list = can_rcv_list_find(&can_id, &mask, dev_rcv_lists); - - rcv->can_id = can_id; - rcv->mask = mask; - rcv->matches = 0; - rcv->func = func; - rcv->data = data; - rcv->ident = ident; - rcv->sk = sk; - - hlist_add_head_rcu(&rcv->list, rcv_list); - dev_rcv_lists->entries++; - - rcv_lists_stats->rcv_entries++; - rcv_lists_stats->rcv_entries_max = max(rcv_lists_stats->rcv_entries_max, - rcv_lists_stats->rcv_entries); - } else { - kmem_cache_free(rcv_cache, rcv); - err = -ENODEV; - } + rcv_list = can_rcv_list_find(&can_id, &mask, dev_rcv_lists); + + rcv->can_id = can_id; + rcv->mask = mask; + rcv->matches = 0; + rcv->func = func; + rcv->data = data; + rcv->ident = ident; + rcv->sk = sk; + hlist_add_head_rcu(&rcv->list, rcv_list); + dev_rcv_lists->entries++; + + rcv_lists_stats->rcv_entries++; + rcv_lists_stats->rcv_entries_max = max(rcv_lists_stats->rcv_entries_max, + rcv_lists_stats->rcv_entries); spin_unlock(&net->can.can_rcvlists_lock); return err; @@ -557,13 +551,6 @@ void can_rx_unregister(struct net *net, struct net_device *dev, canid_t can_id, spin_lock(&net->can.can_rcvlists_lock); dev_rcv_lists = can_dev_rcv_lists_find(net, dev); - if (!dev_rcv_lists) { - pr_err("BUG: receive list not found for " - "dev %s, id %03X, mask %03X\n", - DNAME(dev), can_id, mask); - goto out; - } - rcv_list = can_rcv_list_find(&can_id, &mask, dev_rcv_lists); /* @@ -700,8 +687,7 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) /* find receive list for this device */ dev_rcv_lists = can_dev_rcv_lists_find(net, dev); - if (dev_rcv_lists) - matches += can_rcv_filter(dev_rcv_lists, skb); + matches += can_rcv_filter(dev_rcv_lists, skb); rcu_read_unlock(); -- 2.25.1