6.8-stable review patch. If anyone has any objections, please let me know.
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From: Christian Marangi ansuelsmth@gmail.com
commit 6a4aee277740d04ac0fd54cfa17cc28261932ddc upstream.
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 Reviewed-by: Andrew Lunn andrew@lunn.ch Link: https://lore.kernel.org/r/20240325190621.2665-1-ansuelsmth@gmail.com Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/phy/at803x.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/phy/at803x.c +++ b/drivers/net/phy/at803x.c @@ -1503,7 +1503,7 @@ static int at8031_parse_dt(struct phy_de
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; @@ -1512,6 +1512,8 @@ static int at8031_probe(struct phy_devic if (ret) return ret;
+ priv = phydev->priv; + /* Only supported on AR8031/AR8033, the AR8030/AR8035 use strapping * options. */