1 files changed, 35 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/701-net-0391-drivers-net-phy-don-t-crash-in-phy_read-_write_mmd-w.patch b/target/linux/layerscape/patches-5.4/701-net-0391-drivers-net-phy-don-t-crash-in-phy_read-_write_mmd-w.patch
new file mode 100644
index 0000000000..532715d0bc
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/701-net-0391-drivers-net-phy-don-t-crash-in-phy_read-_write_mmd-w.patch
@@ -0,0 +1,35 @@
+From 8e515a39805c013229698e1a142e16701f07edf9 Mon Sep 17 00:00:00 2001
+From: Alex Marginean <alexandru.marginean@nxp.com>
+Date: Tue, 7 Jan 2020 16:50:31 +0200
+Subject: [PATCH] drivers: net: phy: don't crash in phy_read/_write_mmd without
+ a PHY driver
+
+The APIs can be used by Ethernet drivers to configure internal PHYs
+without actually loading a PHY driver.  Check that drv is not NULL before
+reading from it.
+
+Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
+---
+ drivers/net/phy/phy-core.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/drivers/net/phy/phy-core.c
++++ b/drivers/net/phy/phy-core.c
+@@ -379,7 +379,7 @@ int __phy_read_mmd(struct phy_device *ph
+ 	if (regnum > (u16)~0 || devad > 32)
+ 		return -EINVAL;
+ 
+-	if (phydev->drv->read_mmd) {
++	if (phydev->drv && phydev->drv->read_mmd) {
+ 		val = phydev->drv->read_mmd(phydev, devad, regnum);
+ 	} else if (phydev->is_c45) {
+ 		u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);
+@@ -436,7 +436,7 @@ int __phy_write_mmd(struct phy_device *p
+ 	if (regnum > (u16)~0 || devad > 32)
+ 		return -EINVAL;
+ 
+-	if (phydev->drv->write_mmd) {
++	if (phydev->drv && phydev->drv->write_mmd) {
+ 		ret = phydev->drv->write_mmd(phydev, devad, regnum, val);
+ 	} else if (phydev->is_c45) {
+ 		u32 addr = MII_ADDR_C45 | (devad << 16) | (regnum & 0xffff);