ethernet: sun: add check for the mdesc_grab()
authorLiang He <windhl@126.com>
Wed, 15 Mar 2023 06:00:21 +0000 (14:00 +0800)
committerDavid S. Miller <davem@davemloft.net>
Fri, 17 Mar 2023 07:47:39 +0000 (07:47 +0000)
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>
drivers/net/ethernet/sun/ldmvsw.c
drivers/net/ethernet/sun/sunvnet.c

index 8addee6..734a817 100644 (file)
@@ -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) {
index fe86fbd..e220620 100644 (file)
@@ -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");