diff options
author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-11-29 21:31:23 (GMT) |
---|---|---|
committer | Roland Dreier <roland@purestorage.com> | 2011-11-29 21:37:11 (GMT) |
commit | 580da35a31f91a594f3090b7a2c39b85cb051a12 (patch) | |
tree | 8cb8f106fe3c5df725dbde3efd2bfd19e0f38a2e | |
parent | 1ea6b8f48918282bdca0b32a34095504ee65bab5 (diff) | |
download | linux-fsl-qoriq-580da35a31f91a594f3090b7a2c39b85cb051a12.tar.xz |
IB: Fix RCU lockdep splats
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@ualberta.ca>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>
Cc: <stable@kernel.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>
-rw-r--r-- | drivers/infiniband/core/addr.c | 9 | ||||
-rw-r--r-- | drivers/infiniband/hw/cxgb3/iwch_cm.c | 4 | ||||
-rw-r--r-- | drivers/infiniband/hw/cxgb4/cm.c | 6 | ||||
-rw-r--r-- | drivers/infiniband/hw/nes/nes_cm.c | 6 | ||||
-rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 18 | ||||
-rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_multicast.c | 6 |
6 files changed, 35 insertions, 14 deletions
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c index 691276b..e9cf51b 100644 --- a/drivers/infiniband/core/addr.c +++ b/drivers/infiniband/core/addr.c @@ -216,7 +216,9 @@ 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; @@ -274,15 +276,16 @@ 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 de6d077..c88b12b 100644 --- a/drivers/infiniband/hw/cxgb3/iwch_cm.c +++ b/drivers/infiniband/hw/cxgb3/iwch_cm.c @@ -1375,8 +1375,10 @@ 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__); @@ -1946,10 +1948,12 @@ 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 b36cdac..75b57bee 100644 --- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -1594,6 +1594,7 @@ 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); @@ -1620,6 +1621,7 @@ 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__); @@ -1820,6 +1822,7 @@ static int c4iw_reconnect(struct c4iw_ep *ep) } ep->dst = &rt->dst; + rcu_read_lock(); neigh = dst_get_neighbour(ep->dst); /* get a l2t entry */ @@ -1856,6 +1859,7 @@ static int c4iw_reconnect(struct c4iw_ep *ep) 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; @@ -2301,6 +2305,7 @@ 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 */ @@ -2339,6 +2344,7 @@ int c4iw_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param) ep->retry_with_mpa_v1 = 0; ep->tried_with_mpa_v1 = 0; } + 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 dfce9ea..0a52d72 100644 --- a/drivers/infiniband/hw/nes/nes_cm.c +++ b/drivers/infiniband/hw/nes/nes_cm.c @@ -1377,9 +1377,11 @@ 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 7567b60..ef38848 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 1b7a976..cad1894 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c @@ -266,7 +266,7 @@ 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)); @@ -722,6 +722,8 @@ 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)) { @@ -734,7 +736,7 @@ 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; |