On reworking and splitting the at803x driver, in splitting function of at803x PHYs it was added a NULL dereference bug where priv is referenced before it's actually allocated and then is tried to write to for the is_1000basex and is_fiber variables in the case of at8031, writing on the wrong address.

Fix this by correctly setting priv local variable only after at803x_probe is called and actually allocates priv in the phydev struct.

Reported-by: William Wortel wwortel@dorpstraat.com Cc: stable@vger.kernel.org Fixes: 25d2ba94005f ("net: phy: at803x: move specific at8031 probe mode check to dedicated probe") Signed-off-by: Christian Marangi ansuelsmth@gmail.com --- drivers/net/phy/qcom/at803x.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/qcom/at803x.c b/drivers/net/phy/qcom/at803x.c index 4717c59d51d0..e79657f76bea 100644 --- a/drivers/net/phy/qcom/at803x.c +++ b/drivers/net/phy/qcom/at803x.c @@ -797,7 +797,7 @@ static int at8031_parse_dt(struct phy_device *phydev)

static int at8031_probe(struct phy_device *phydev) { - struct at803x_priv *priv = phydev->priv; + struct at803x_priv *priv; int mode_cfg; int ccr; int ret; @@ -806,6 +806,8 @@ static int at8031_probe(struct phy_device *phydev) if (ret) return ret;

+ priv = phydev->priv; + /* Only supported on AR8031/AR8033, the AR8030/AR8035 use strapping * options. */