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Message-Id: <66w.ZbGt.65Ljx42yHo5.1csjxu@seznam.cz>
Date: Fri, 06 Sep 2024 12:52:40 +0200 (CEST)
From: "Tomas Paukrt" <tomaspaukrt@...il.cz>
To: <netdev@...r.kernel.org>
Cc: "Andrew Lunn" <andrew@...n.ch>,
"Heiner Kallweit" <hkallweit1@...il.com>,
"Russell King" <linux@...linux.org.uk>,
"David S. Miller" <davem@...emloft.net>,
"Eric Dumazet" <edumazet@...gle.com>,
"Jakub Kicinski" <kuba@...nel.org>,
"Paolo Abeni" <pabeni@...hat.com>,
"Catalin Popescu" <catalin.popescu@...ca-geosystems.com>,
"Simon Horman" <horms@...nel.org>
Subject: [PATCH net v2] net: phy: dp83822: Fix NULL pointer dereference on DP83825 devices
The probe() function is only used for DP83822 and DP83826 PHY,
leaving the private data pointer uninitialized for the DP83825 models
which causes a NULL pointer dereference in the recently introduced/changed
functions dp8382x_config_init() and dp83822_set_wol().
Add the dp8382x_probe() function, so all PHY models will have a valid
private data pointer to fix this issue and also prevent similar issues
in the future.
Fixes: 9ef9ecfa9e9f ("net: phy: dp8382x: keep WOL settings across suspends")
Signed-off-by: Tomas Paukrt <tomaspaukrt@...il.cz>
---
Changes since v1:
- Reused the newly introduced function in dp83822_probe() and dp83826_probe()
---
drivers/net/phy/dp83822.c | 35 ++++++++++++++++++++++-------------
1 file changed, 22 insertions(+), 13 deletions(-)
diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
index efeb643..fc247f4 100644
--- a/drivers/net/phy/dp83822.c
+++ b/drivers/net/phy/dp83822.c
@@ -271,8 +271,7 @@ static int dp83822_config_intr(struct phy_device *phydev)
DP83822_ENERGY_DET_INT_EN |
DP83822_LINK_QUAL_INT_EN);
- /* Private data pointer is NULL on DP83825 */
- if (!dp83822 || !dp83822->fx_enabled)
+ if (!dp83822->fx_enabled)
misr_status |= DP83822_ANEG_COMPLETE_INT_EN |
DP83822_DUP_MODE_CHANGE_INT_EN |
DP83822_SPEED_CHANGED_INT_EN;
@@ -292,8 +291,7 @@ static int dp83822_config_intr(struct phy_device *phydev)
DP83822_PAGE_RX_INT_EN |
DP83822_EEE_ERROR_CHANGE_INT_EN);
- /* Private data pointer is NULL on DP83825 */
- if (!dp83822 || !dp83822->fx_enabled)
+ if (!dp83822->fx_enabled)
misr_status |= DP83822_ANEG_ERR_INT_EN |
DP83822_WOL_PKT_INT_EN;
@@ -691,10 +689,9 @@ static int dp83822_read_straps(struct phy_device *phydev)
return 0;
}
-static int dp83822_probe(struct phy_device *phydev)
+static int dp8382x_probe(struct phy_device *phydev)
{
struct dp83822_private *dp83822;
- int ret;
dp83822 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83822),
GFP_KERNEL);
@@ -703,6 +700,20 @@ static int dp83822_probe(struct phy_device *phydev)
phydev->priv = dp83822;
+ return 0;
+}
+
+static int dp83822_probe(struct phy_device *phydev)
+{
+ struct dp83822_private *dp83822;
+ int ret;
+
+ ret = dp8382x_probe(phydev);
+ if (ret)
+ return ret;
+
+ dp83822 = phydev->priv;
+
ret = dp83822_read_straps(phydev);
if (ret)
return ret;
@@ -717,14 +728,11 @@ static int dp83822_probe(struct phy_device *phydev)
static int dp83826_probe(struct phy_device *phydev)
{
- struct dp83822_private *dp83822;
-
- dp83822 = devm_kzalloc(&phydev->mdio.dev, sizeof(*dp83822),
- GFP_KERNEL);
- if (!dp83822)
- return -ENOMEM;
+ int ret;
- phydev->priv = dp83822;
+ ret = dp8382x_probe(phydev);
+ if (ret)
+ return ret;
dp83826_of_init(phydev);
@@ -795,6 +803,7 @@ static int dp83822_resume(struct phy_device *phydev)
PHY_ID_MATCH_MODEL(_id), \
.name = (_name), \
/* PHY_BASIC_FEATURES */ \
+ .probe = dp8382x_probe, \
.soft_reset = dp83822_phy_reset, \
.config_init = dp8382x_config_init, \
.get_wol = dp83822_get_wol, \
--
2.7.4
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