commit 878a20aa15880e8b0cc2009331e7b207b7c668c0
author Ioana Ciornei <ioana.ciornei@nxp.com> Thu Jan 05 17:09:48 2023 +0200
committer Tom Rini <trini@konsulko.com> Thu Feb 02 14:44:53 2023 -0500
tree db56063fd5261f9eb39514151574db1c75b07973
parent cfbd388ae756aac9151f21c9eb09d53f79360e6e

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>

drivers/net/fsl_ls_mdio.c

diff --git a/drivers/net/fsl_ls_mdio.c b/drivers/net/fsl_ls_mdio.c
index f213e0d..fce7393 100644
--- a/drivers/net/fsl_ls_mdio.c
+++ b/drivers/net/fsl_ls_mdio.c
@@ -124,6 +124,9 @@
 	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,