RDMA/cma: Protect cma dev list with lock

When AF_IB addresses are used during rdma_resolve_addr() a lock is not
held. A cma device can get removed while list traversal is in progress
which may lead to crash. ie

        CPU0                                     CPU1
        ====                                     ====
rdma_resolve_addr()
 cma_resolve_ib_dev()
  list_for_each()                         cma_remove_one()
    cur_dev->device                        mutex_lock(&lock)
                                            list_del();
                                           mutex_unlock(&lock);
                                           cma_process_remove();

Therefore, hold a lock while traversing the list which avoids such
situation.

Cc: <stable@vger.kernel.org> # 3.10
Fixes: f17df3b0dede ("RDMA/cma: Add support for AF_IB to rdma_resolve_addr()")
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index f72677291b692511ce7abcf1e9e8da9bf8f06326..a36c94930c31de8a03652cbf07844c10bcc09877 100644 (file)
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -724,6 +724,7 @@ static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
        dgid = (union ib_gid *) &addr->sib_addr;
        pkey = ntohs(addr->sib_pkey);
 
+       mutex_lock(&lock);
        list_for_each_entry(cur_dev, &dev_list, list) {
                for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
                        if (!rdma_cap_af_ib(cur_dev->device, p))
@@ -750,18 +751,19 @@ static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
                                        cma_dev = cur_dev;
                                        sgid = gid;
                                        id_priv->id.port_num = p;
+                                       goto found;
                                }
                        }
                }
        }
-
-       if (!cma_dev)
-               return -ENODEV;
+       mutex_unlock(&lock);
+       return -ENODEV;
 
 found:
        cma_attach_to_dev(id_priv, cma_dev);
-       addr = (struct sockaddr_ib *) cma_src_addr(id_priv);
-       memcpy(&addr->sib_addr, &sgid, sizeof sgid);
+       mutex_unlock(&lock);
+       addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
+       memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
        cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
        return 0;
 }