[PATCH net 0/1] net: stmmac: dwmac-nuvoton: fix NULL pointer dereference in nvt_set_phy_intf_sel()

[PATCH net 0/1] net: stmmac: dwmac-nuvoton: fix NULL pointer dereference in nvt_set_phy_intf_sel()

[Joey Lu]

This series fixes a NULL pointer dereference bug introduced in the
initial dwmac-nuvoton glue driver. The struct nvt_priv_data::dev field
was never initialized after devm_kzalloc(), leaving it NULL. When
phylink later calls nvt_set_phy_intf_sel() for interface selection,
the callback dereferences priv->dev via nvt_gmac_get_delay(), triggering
a NULL pointer dereference.

Joey Lu (1):
  net: stmmac: dwmac-nuvoton: fix NULL pointer dereference in
    nvt_set_phy_intf_sel()

 drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.43.0

[PATCH net 1/1] net: stmmac: dwmac-nuvoton: fix NULL pointer dereference in nvt_set_phy_intf_sel()

[Joey Lu]

priv->dev was never initialized after devm_kzalloc() allocates the
private data structure. When nvt_set_phy_intf_sel() is later invoked
via the phylink interface_select callback, it calls
nvt_gmac_get_delay(priv->dev, ...) which dereferences the NULL pointer.

Fix this by assigning priv->dev = dev immediately after allocation.

Fixes: 4d7c557f58ef ("net: stmmac: dwmac-nuvoton: Add dwmac glue for Nuvoton MA35 family")
Signed-off-by: Joey Lu <a0987203069@gmail.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c
index e2240b68ad98..2ab6ecac6422 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c
@@ -100,6 +100,8 @@ static int nvt_gmac_probe(struct platform_device *pdev)
 	if (!priv)
 		return dev_err_probe(dev, -ENOMEM, "Failed to allocate private data\n");
 
+	priv->dev = dev;
+
 	priv->regmap = syscon_regmap_lookup_by_phandle_args(dev->of_node, "nuvoton,sys",
 							    1, &priv->macid);
 	if (IS_ERR(priv->regmap))
-- 
2.43.0

Re: [PATCH net 0/1] net: stmmac: dwmac-nuvoton: fix NULL pointer dereference in nvt_set_phy_intf_sel()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed,  6 May 2026 16:46:12 +0800 you wrote:
> This series fixes a NULL pointer dereference bug introduced in the
> initial dwmac-nuvoton glue driver. The struct nvt_priv_data::dev field
> was never initialized after devm_kzalloc(), leaving it NULL. When
> phylink later calls nvt_set_phy_intf_sel() for interface selection,
> the callback dereferences priv->dev via nvt_gmac_get_delay(), triggering
> a NULL pointer dereference.
> 
> [...]

Here is the summary with links:
  - [net,1/1] net: stmmac: dwmac-nuvoton: fix NULL pointer dereference in nvt_set_phy_intf_sel()
    https://git.kernel.org/netdev/net/c/dedf6c90386d

You are awesome, thank you!
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