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Date: Wed, 5 Jun 2024 21:53:55 +0200
From: Petr Malat <oss@...at.biz>
To: netdev@...r.kernel.org
Cc: edumazet@...gle.com,
davem@...emloft.net,
Petr Malat <oss@...at.biz>
Subject: [PATCH] ip6mr: Fix lockdep and sparse RCU warnings
ip6mr_vif_seq_start() must lock RCU even in a case of error, because
stop callback is called unconditionally.
When IPV6_MROUTE_MULTIPLE_TABLES is enabled, calls to ip6mr_get_table
should be done under RCU or RTNL lock. Lock RCU before the call unless
it's done already or RTNL lock is held.
Signed-off-by: Petr Malat <oss@...at.biz>
---
net/ipv6/ip6mr.c | 52 +++++++++++++++++++++++++++++++-----------------
1 file changed, 34 insertions(+), 18 deletions(-)
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index cb0ee81a068a..bf6932535d6d 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -411,13 +411,14 @@ static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
struct net *net = seq_file_net(seq);
struct mr_table *mrt;
+ rcu_read_lock();
+
mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
if (!mrt)
return ERR_PTR(-ENOENT);
iter->mrt = mrt;
- rcu_read_lock();
return mr_vif_seq_start(seq, pos);
}
@@ -1885,17 +1886,21 @@ int ip6mr_ioctl(struct sock *sk, int cmd, void *arg)
struct net *net = sock_net(sk);
struct mr_table *mrt;
+ rcu_read_lock();
mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
- if (!mrt)
+ if (!mrt) {
+ rcu_read_unlock();
return -ENOENT;
+ }
switch (cmd) {
case SIOCGETMIFCNT_IN6:
vr = (struct sioc_mif_req6 *)arg;
- if (vr->mifi >= mrt->maxvif)
+ if (vr->mifi >= mrt->maxvif) {
+ rcu_read_unlock();
return -EINVAL;
+ }
vr->mifi = array_index_nospec(vr->mifi, mrt->maxvif);
- rcu_read_lock();
vif = &mrt->vif_table[vr->mifi];
if (VIF_EXISTS(mrt, vr->mifi)) {
vr->icount = READ_ONCE(vif->pkt_in);
@@ -1910,7 +1915,6 @@ int ip6mr_ioctl(struct sock *sk, int cmd, void *arg)
case SIOCGETSGCNT_IN6:
sr = (struct sioc_sg_req6 *)arg;
- rcu_read_lock();
c = ip6mr_cache_find(mrt, &sr->src.sin6_addr,
&sr->grp.sin6_addr);
if (c) {
@@ -1923,6 +1927,7 @@ int ip6mr_ioctl(struct sock *sk, int cmd, void *arg)
rcu_read_unlock();
return -EADDRNOTAVAIL;
default:
+ rcu_read_unlock();
return -ENOIOCTLCMD;
}
}
@@ -1953,18 +1958,33 @@ int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
struct net *net = sock_net(sk);
struct mr_table *mrt;
+ switch (cmd) {
+ case SIOCGETMIFCNT_IN6:
+ if (copy_from_user(&vr, arg, sizeof(vr)))
+ return -EFAULT;
+ break;
+ case SIOCGETSGCNT_IN6:
+ if (copy_from_user(&sr, arg, sizeof(sr)))
+ return -EFAULT;
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ rcu_read_lock();
mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
- if (!mrt)
+ if (!mrt) {
+ rcu_read_unlock();
return -ENOENT;
+ }
switch (cmd) {
case SIOCGETMIFCNT_IN6:
- if (copy_from_user(&vr, arg, sizeof(vr)))
- return -EFAULT;
- if (vr.mifi >= mrt->maxvif)
+ if (vr.mifi >= mrt->maxvif) {
+ rcu_read_unlock();
return -EINVAL;
+ }
vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif);
- rcu_read_lock();
vif = &mrt->vif_table[vr.mifi];
if (VIF_EXISTS(mrt, vr.mifi)) {
vr.icount = READ_ONCE(vif->pkt_in);
@@ -1980,10 +2000,6 @@ int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
rcu_read_unlock();
return -EADDRNOTAVAIL;
case SIOCGETSGCNT_IN6:
- if (copy_from_user(&sr, arg, sizeof(sr)))
- return -EFAULT;
-
- rcu_read_lock();
c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
if (c) {
sr.pktcnt = c->_c.mfc_un.res.pkt;
@@ -1997,8 +2013,6 @@ int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
}
rcu_read_unlock();
return -EADDRNOTAVAIL;
- default:
- return -ENOIOCTLCMD;
}
}
#endif
@@ -2275,11 +2289,13 @@ int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm,
struct mfc6_cache *cache;
struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
+ rcu_read_lock();
mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
- if (!mrt)
+ if (!mrt) {
+ rcu_read_lock();
return -ENOENT;
+ }
- rcu_read_lock();
cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
if (!cache && skb->dev) {
int vif = ip6mr_find_vif(mrt, skb->dev);
--
2.39.2
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