drivers: net: fsl_ls_mdio: prevent a NULL pointer dereference

Prevent a NULL pointer dereference in the probe path by checking the
return valud of dev_read_addr_ptr() against NULL.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>

diff --git a/drivers/net/fsl_ls_mdio.c b/drivers/net/fsl_ls_mdio.c
index f213e0dd85901a4d094300fbf53ca5b992329f4e..fce73937502df8c49f1507b7bfa36ff19d24629d 100644 (file)
--- a/drivers/net/fsl_ls_mdio.c
+++ b/drivers/net/fsl_ls_mdio.c
@@ -124,6 +124,9 @@ static int fsl_ls_mdio_probe(struct udevice *dev)
        struct memac_mdio_controller *regs;
 
        priv->regs_base = dev_read_addr_ptr(dev);
+       if (!priv->regs_base)
+               return -ENODEV;
+
        regs = (struct memac_mdio_controller *)(priv->regs_base);
 
        memac_setbits_32(&regs->mdio_stat,