net: stmmac: fix kernel panic due to NULL pointer dereference of mdio_bus_data

Fixed link does not need mdio bus and in that case mdio_bus_data will
not be allocated. Before using mdio_bus_data we should check for NULL.

This patch fix the kernel panic due to NULL pointer dereference of
mdio_bus_data when it is not allocated.

Without this patch we do see following kernel crash caused due to kernel
NULL pointer dereference.

Call trace:
stmmac_dvr_probe+0x3c/0x10b0
dwc_eth_dwmac_probe+0x224/0x378
platform_probe+0x68/0xe0
really_probe+0x130/0x3d8
driver_probe_device+0x68/0xd0
device_driver_attach+0x74/0x80
__driver_attach+0x58/0xf8
bus_for_each_dev+0x7c/0xd8
driver_attach+0x24/0x30
bus_add_driver+0x148/0x1f0
driver_register+0x64/0x120
__platform_driver_register+0x28/0x38
dwc_eth_dwmac_driver_init+0x1c/0x28
do_one_initcall+0x78/0x158
kernel_init_freeable+0x1f0/0x244
kernel_init+0x14/0x118
ret_from_fork+0x10/0x30
Code: f9002bfb 9113e2d9 910e6273 aa0003f7 (f9405c78)
---[ end trace 32d9d41562ddc081 ]---

Fixes: e5e5b771 ("net: stmmac: make in-band AN mode parsing is supported for non-DT")
Signed-off-by: Sriranjani P <sriranjani.p@samsung.com>
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Link: https://lore.kernel.org/r/20210528071056.35252-1-sriranjani.p@samsung.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -1240,8 +1240,9 @@ static int stmmac_phy_setup(struct stmmac_priv *priv)
 	priv->phylink_config.dev = &priv->dev->dev;
 	priv->phylink_config.type = PHYLINK_NETDEV;
 	priv->phylink_config.pcs_poll = true;
-	priv->phylink_config.ovr_an_inband =
-		priv->plat->mdio_bus_data->xpcs_an_inband;
+	if (priv->plat->mdio_bus_data)
+		priv->phylink_config.ovr_an_inband =
+			priv->plat->mdio_bus_data->xpcs_an_inband;
 
 	if (!fwnode)
 		fwnode = dev_fwnode(priv->device);