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net: netlink: add the case when nlh is NULL 

Add the case when nlh is NULL in nlmsg_report(),
so that the caller doesn't need to deal with this case.

Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yajun Deng 2021-07-27 11:41:41 +08:00 committed by David S. Miller
parent b0e8181762
commit f9b282b36d
3 changed files with 6 additions and 11 deletions
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2
include/net/netlink.h
View File

@ -885,7 +885,7 @@ static inline int nlmsg_validate_deprecated(const struct nlmsghdr *nlh,
*/
static inline int nlmsg_report(const struct nlmsghdr *nlh)
{
return !!(nlh->nlmsg_flags & NLM_F_ECHO);
return nlh ? !!(nlh->nlmsg_flags & NLM_F_ECHO) : 0;
}
/**

6
net/core/rtnetlink.c
View File

@ -726,12 +726,8 @@ void rtnl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
struct nlmsghdr *nlh, gfp_t flags)
{
struct sock *rtnl = net->rtnl;
int report = 0;
if (nlh)
report = nlmsg_report(nlh);
nlmsg_notify(rtnl, skb, pid, group, report, flags);
nlmsg_notify(rtnl, skb, pid, group, nlmsg_report(nlh), flags);
}
EXPORT_SYMBOL(rtnl_notify);

9
net/netlink/genetlink.c
View File

@ -1485,6 +1485,7 @@ int genlmsg_multicast_allns(const struct genl_family *family,
{
if (WARN_ON_ONCE(group >= family->n_mcgrps))
return -EINVAL;
group = family->mcgrp_offset + group;
return genlmsg_mcast(skb, portid, group, flags);
}
@ -1495,14 +1496,12 @@ void genl_notify(const struct genl_family *family, struct sk_buff *skb,
{
struct net *net = genl_info_net(info);
struct sock *sk = net->genl_sock;
int report = 0;
if (info->nlhdr)
report = nlmsg_report(info->nlhdr);
if (WARN_ON_ONCE(group >= family->n_mcgrps))
return;
group = family->mcgrp_offset + group;
nlmsg_notify(sk, skb, info->snd_portid, group, report, flags);
nlmsg_notify(sk, skb, info->snd_portid, group,
nlmsg_report(info->nlhdr), flags);
}
EXPORT_SYMBOL(genl_notify);