ethernet: sun: add check for the mdesc_grab()

[ Upstream commit 90de546d9a0b3c771667af18bb3f80567eabb89b ]

In vnet_port_probe() and vsw_port_probe(), we should
check the return value of mdesc_grab() as it may
return NULL which can caused NPD bugs.

Fixes: 5d01fa0c6bd8 ("ldmvsw: Add ldmvsw.c driver code")
Fixes: 43fdf27470b2 ("[SPARC64]: Abstract out mdesc accesses for better MD update handling.")
Signed-off-by: Liang He <windhl@126.com>
Reviewed-by: Piotr Raczynski <piotr.raczynski@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/sun/ldmvsw.c b/drivers/net/ethernet/sun/ldmvsw.c
index 8addee6..734a817 100644 (file)
--- a/drivers/net/ethernet/sun/ldmvsw.c
+++ b/drivers/net/ethernet/sun/ldmvsw.c
@@ -287,6 +287,9 @@ static int vsw_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 
        hp = mdesc_grab();
 
+       if (!hp)
+               return -ENODEV;
+
        rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
        err = -ENODEV;
        if (!rmac) {

diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index acda6cb..bdf4c8b 100644 (file)
--- a/drivers/net/ethernet/sun/sunvnet.c
+++ b/drivers/net/ethernet/sun/sunvnet.c
@@ -433,6 +433,9 @@ static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 
        hp = mdesc_grab();
 
+       if (!hp)
+               return -ENODEV;
+
        vp = vnet_find_parent(hp, vdev->mp, vdev);
        if (IS_ERR(vp)) {
                pr_err("Cannot find port parent vnet\n");