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Date: Tue, 06 Dec 2011 16:33:17 -0500 (EST)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
CC: roland@...nel.org
Subject: [PATCH 4/13 net-3.1-stable] IB: Fix RCU lockdep splats
From: Eric Dumazet <eric.dumazet@...il.com>
[ Upstream commit 580da35a31f91a594f3090b7a2c39b85cb051a12 ]
Commit f2c31e32b37 ("net: fix NULL dereferences in check_peer_redir()")
forgot to take care of infiniband uses of dst neighbours.
Many thanks to Marc Aurele who provided a nice bug report and feedback.
Reported-by: Marc Aurele La France <tsi@...berta.ca>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Cc: David Miller <davem@...emloft.net>
Cc: <stable@...nel.org>
Signed-off-by: Roland Dreier <roland@...estorage.com>
---
drivers/infiniband/core/addr.c | 9 ++++++---
drivers/infiniband/hw/cxgb3/iwch_cm.c | 4 ++++
drivers/infiniband/hw/cxgb4/cm.c | 4 ++++
drivers/infiniband/hw/nes/nes_cm.c | 6 ++++--
drivers/infiniband/ulp/ipoib/ipoib_main.c | 18 +++++++++++-------
drivers/infiniband/ulp/ipoib/ipoib_multicast.c | 6 ++++--
6 files changed, 33 insertions(+), 14 deletions(-)
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 236ad9a..f2a84c6 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -215,7 +215,9 @@ static int addr4_resolve(struct sockaddr_in *src_in,
neigh = neigh_lookup(&arp_tbl, &rt->rt_gateway, rt->dst.dev);
if (!neigh || !(neigh->nud_state & NUD_VALID)) {
+ rcu_read_lock();
neigh_event_send(dst_get_neighbour(&rt->dst), NULL);
+ rcu_read_unlock();
ret = -ENODATA;
if (neigh)
goto release;
@@ -273,15 +275,16 @@ static int addr6_resolve(struct sockaddr_in6 *src_in,
goto put;
}
+ rcu_read_lock();
neigh = dst_get_neighbour(dst);
if (!neigh || !(neigh->nud_state & NUD_VALID)) {
if (neigh)
neigh_event_send(neigh, NULL);
ret = -ENODATA;
- goto put;
+ } else {
+ ret = rdma_copy_addr(addr, dst->dev, neigh->ha);
}
-
- ret = rdma_copy_addr(addr, dst->dev, neigh->ha);
+ rcu_read_unlock();
put:
dst_release(dst);
return ret;
diff --git a/drivers/infiniband/hw/cxgb3/iwch_cm.c b/drivers/infiniband/hw/cxgb3/iwch_cm.c
index 6cd642a..e55ce7a 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_cm.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_cm.c
@@ -1365,8 +1365,10 @@ static int pass_accept_req(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
goto reject;
}
dst = &rt->dst;
+ rcu_read_lock();
neigh = dst_get_neighbour(dst);
l2t = t3_l2t_get(tdev, neigh, neigh->dev);
+ rcu_read_unlock();
if (!l2t) {
printk(KERN_ERR MOD "%s - failed to allocate l2t entry!\n",
__func__);
@@ -1936,10 +1938,12 @@ int iwch_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
}
ep->dst = &rt->dst;
+ rcu_read_lock();
neigh = dst_get_neighbour(ep->dst);
/* get a l2t entry */
ep->l2t = t3_l2t_get(ep->com.tdev, neigh, neigh->dev);
+ rcu_read_unlock();
if (!ep->l2t) {
printk(KERN_ERR MOD "%s - cannot alloc l2e.\n", __func__);
err = -ENOMEM;
diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 77f769d..daa93e9 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -1358,6 +1358,7 @@ static int pass_accept_req(struct c4iw_dev *dev, struct sk_buff *skb)
goto reject;
}
dst = &rt->dst;
+ rcu_read_lock();
neigh = dst_get_neighbour(dst);
if (neigh->dev->flags & IFF_LOOPBACK) {
pdev = ip_dev_find(&init_net, peer_ip);
@@ -1384,6 +1385,7 @@ static int pass_accept_req(struct c4iw_dev *dev, struct sk_buff *skb)
rss_qid = dev->rdev.lldi.rxq_ids[
cxgb4_port_idx(neigh->dev) * step];
}
+ rcu_read_unlock();
if (!l2t) {
printk(KERN_ERR MOD "%s - failed to allocate l2t entry!\n",
__func__);
@@ -1909,6 +1911,7 @@ int c4iw_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
}
ep->dst = &rt->dst;
+ rcu_read_lock();
neigh = dst_get_neighbour(ep->dst);
/* get a l2t entry */
@@ -1945,6 +1948,7 @@ int c4iw_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
ep->rss_qid = ep->com.dev->rdev.lldi.rxq_ids[
cxgb4_port_idx(neigh->dev) * step];
}
+ rcu_read_unlock();
if (!ep->l2t) {
printk(KERN_ERR MOD "%s - cannot alloc l2e.\n", __func__);
err = -ENOMEM;
diff --git a/drivers/infiniband/hw/nes/nes_cm.c b/drivers/infiniband/hw/nes/nes_cm.c
index c118663..a237547 100644
--- a/drivers/infiniband/hw/nes/nes_cm.c
+++ b/drivers/infiniband/hw/nes/nes_cm.c
@@ -1150,9 +1150,11 @@ static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpi
neigh_release(neigh);
}
- if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID)))
+ if ((neigh == NULL) || (!(neigh->nud_state & NUD_VALID))) {
+ rcu_read_lock();
neigh_event_send(dst_get_neighbour(&rt->dst), NULL);
-
+ rcu_read_unlock();
+ }
ip_rt_put(rt);
return rc;
}
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index fe89c46..a98c414 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -555,6 +555,7 @@ static int path_rec_start(struct net_device *dev,
return 0;
}
+/* called with rcu_read_lock */
static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
@@ -636,6 +637,7 @@ err_drop:
spin_unlock_irqrestore(&priv->lock, flags);
}
+/* called with rcu_read_lock */
static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
@@ -720,13 +722,14 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
struct neighbour *n = NULL;
unsigned long flags;
+ rcu_read_lock();
if (likely(skb_dst(skb)))
n = dst_get_neighbour(skb_dst(skb));
if (likely(n)) {
if (unlikely(!*to_ipoib_neigh(n))) {
ipoib_path_lookup(skb, dev);
- return NETDEV_TX_OK;
+ goto unlock;
}
neigh = *to_ipoib_neigh(n);
@@ -749,17 +752,17 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
ipoib_neigh_free(dev, neigh);
spin_unlock_irqrestore(&priv->lock, flags);
ipoib_path_lookup(skb, dev);
- return NETDEV_TX_OK;
+ goto unlock;
}
if (ipoib_cm_get(neigh)) {
if (ipoib_cm_up(neigh)) {
ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
- return NETDEV_TX_OK;
+ goto unlock;
}
} else if (neigh->ah) {
ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(n->ha));
- return NETDEV_TX_OK;
+ goto unlock;
}
if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
@@ -793,13 +796,14 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
phdr->hwaddr + 4);
dev_kfree_skb_any(skb);
++dev->stats.tx_dropped;
- return NETDEV_TX_OK;
+ goto unlock;
}
unicast_arp_send(skb, dev, phdr);
}
}
-
+unlock:
+ rcu_read_unlock();
return NETDEV_TX_OK;
}
@@ -837,7 +841,7 @@ static int ipoib_hard_header(struct sk_buff *skb,
dst = skb_dst(skb);
n = NULL;
if (dst)
- n = dst_get_neighbour(dst);
+ n = dst_get_neighbour_raw(dst);
if ((!dst || !n) && daddr) {
struct ipoib_pseudoheader *phdr =
(struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index ecea4fe..a8d2a89 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -265,7 +265,7 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
skb->dev = dev;
if (dst)
- n = dst_get_neighbour(dst);
+ n = dst_get_neighbour_raw(dst);
if (!dst || !n) {
/* put pseudoheader back on for next time */
skb_push(skb, sizeof (struct ipoib_pseudoheader));
@@ -721,6 +721,8 @@ out:
if (mcast && mcast->ah) {
struct dst_entry *dst = skb_dst(skb);
struct neighbour *n = NULL;
+
+ rcu_read_lock();
if (dst)
n = dst_get_neighbour(dst);
if (n && !*to_ipoib_neigh(n)) {
@@ -733,7 +735,7 @@ out:
list_add_tail(&neigh->list, &mcast->neigh_list);
}
}
-
+ rcu_read_unlock();
spin_unlock_irqrestore(&priv->lock, flags);
ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
return;
--
1.7.7.3
--
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