IB/ipoib: Fix memory leak in create child syscall

The flow of creating a new child goes through ipoib_vlan_add
which allocates a new interface and checks the rtnl_lock.

If the lock is taken, restart_syscall will be called to restart
the system call again. In this case we are not releasing the
already allocated interface, causing a leak.

Fixes: 9baa0b036410 ("IB/ipoib: Add rtnl_link_ops support")
Signed-off-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
index 1ee46194bbf586c56819a2d138e2d627049c72d6..081b33deff1bcbf6f381c9993af174a3dc5e90b4 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -133,13 +133,13 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
        snprintf(intf_name, sizeof intf_name, "%s.%04x",
                 ppriv->dev->name, pkey);
 
+       if (!rtnl_trylock())
+               return restart_syscall();
+
        priv = ipoib_intf_alloc(ppriv->ca, ppriv->port, intf_name);
        if (!priv)
                return -ENOMEM;
 
-       if (!rtnl_trylock())
-               return restart_syscall();
-
        down_write(&ppriv->vlan_rwsem);
 
        /*