RDMA/cxgb4: Fix crash when peer address is 0.0.0.0

When using rping -c -a 0.0.0.0 with iw_cxgb4, the system crashes when
rdma_connect() is called.  ip_dev_find() will return NULL, but pdev is
accessed anyway.

Checking that pdev is NULL and returning -ENODEV prevents the system
from crashing.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 55ab284e22f2c02c037ca67825d24e3d8a827208..b18870c455adde5546ec90a4bf356813bbb34432 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -1593,6 +1593,10 @@ static int import_ep(struct c4iw_ep *ep, __be32 peer_ip, struct dst_entry *dst,
                struct net_device *pdev;
 
                pdev = ip_dev_find(&init_net, peer_ip);
+               if (!pdev) {
+                       err = -ENODEV;
+                       goto out;
+               }
                ep->l2t = cxgb4_l2t_get(cdev->rdev.lldi.l2t,
                                        n, pdev, 0);
                if (!ep->l2t)