From: Ioana Ciornei <ioana.ciornei@nxp.com>
Date: Thu, 5 Jan 2023 15:09:48 +0000 (+0200)
Subject: drivers: net: fsl_ls_mdio: prevent a NULL pointer dereference
X-Git-Tag: v2023.04-rc2~20^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=878a20aa15880e8b0cc2009331e7b207b7c668c0;p=pandora-u-boot.git

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 f213e0dd859..fce73937502 100644
--- 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,