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Date: Sat, 31 Dec 2016 21:41:46 -0500 From: Neil Horman <nhorman@...driver.com> To: Reiter Wolfgang <wr0112358@...il.com> Cc: davem@...emloft.net, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] drop_monitor: add missing call to genlmsg_end On Sat, Dec 31, 2016 at 09:11:57PM +0100, Reiter Wolfgang wrote: > Update nlmsg_len field with genlmsg_end to enable userspace processing > using nlmsg_next helper. Also adds error handling. > > Signed-off-by: Reiter Wolfgang <wr0112358@...il.com> > --- > net/core/drop_monitor.c | 33 ++++++++++++++++++++++++--------- > 1 file changed, 24 insertions(+), 9 deletions(-) > > diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c > index 8e0c063..f465bad 100644 > --- a/net/core/drop_monitor.c > +++ b/net/core/drop_monitor.c > @@ -75,6 +75,7 @@ static struct sk_buff *reset_per_cpu_data(struct per_cpu_dm_data *data) > struct nlattr *nla; > struct sk_buff *skb; > unsigned long flags; > + void *msg_header; > > al = sizeof(struct net_dm_alert_msg); > al += dm_hit_limit * sizeof(struct net_dm_drop_point); > @@ -82,17 +83,31 @@ static struct sk_buff *reset_per_cpu_data(struct per_cpu_dm_data *data) > > skb = genlmsg_new(al, GFP_KERNEL); > > - if (skb) { > - genlmsg_put(skb, 0, 0, &net_drop_monitor_family, > - 0, NET_DM_CMD_ALERT); > - nla = nla_reserve(skb, NLA_UNSPEC, > - sizeof(struct net_dm_alert_msg)); > - msg = nla_data(nla); > - memset(msg, 0, al); > - } else { > - mod_timer(&data->send_timer, jiffies + HZ / 10); > + if (!skb) > + goto err; > + > + msg_header = genlmsg_put(skb, 0, 0, &net_drop_monitor_family, > + 0, NET_DM_CMD_ALERT); > + if (!msg_header) { > + nlmsg_free(skb); > + skb = NULL; > + goto err; > + } > + nla = nla_reserve(skb, NLA_UNSPEC, > + sizeof(struct net_dm_alert_msg)); > + if (!nla) { > + nlmsg_free(skb); > + skb = NULL; > + goto err; > } > + msg = nla_data(nla); > + memset(msg, 0, al); > + genlmsg_end(skb, msg_header); > + goto out; > > +err: > + mod_timer(&data->send_timer, jiffies + HZ / 10); > +out: > spin_lock_irqsave(&data->lock, flags); > swap(data->skb, skb); > spin_unlock_irqrestore(&data->lock, flags); > -- > 2.9.3 > > Acked-by: Neil Horman <nhorman@...driver.com>
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