[U-Boot] [PATCH 1/1] test: dm_mdio: avoid out of bounds access

[Heinrich Schuchardt]

SANDBOX_PHY_REG_CNT is not an allowable index for the array
u16 reg[SANDBOX_PHY_REG_CNT].

Identified by cppcheck.

Fixes: b47edf8069cc ("test: dm_mdio: add a 2nd register to the emulated PHY")
Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 drivers/net/mdio_sandbox.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mdio_sandbox.c b/drivers/net/mdio_sandbox.c
index df053f5381..8b2a11036f 100644
--- a/drivers/net/mdio_sandbox.c
+++ b/drivers/net/mdio_sandbox.c
@@ -27,7 +27,7 @@ static int mdio_sandbox_read(struct udevice *dev, int addr, int devad, int reg)
 		return -ENODEV;
 	if (devad != MDIO_DEVAD_NONE)
 		return -ENODEV;
-	if (reg < 0 || reg > SANDBOX_PHY_REG_CNT)
+	if (reg < 0 || reg >= SANDBOX_PHY_REG_CNT)
 		return -ENODEV;

 	return priv->reg[reg];
--
2.20.1