On Thu, Jan 22, 2026 at 02:13:01PM +0200, Vladimir Oltean wrote:
quoted
quoted
struct mdio_regmap_priv {
struct regmap *regmap;
+ unsigned int base;
Hmm... resource_size_t ?
Well, regmap_read() takes "unsigned int reg".
https://elixir.bootlin.com/linux/v6.18.6/source/include/linux/regmap.h#L1297
So in practice, a truncation will be done somewhere if the register base
exceeds unsigned int storage capacity. But I didn't feel that it's worth
handling that.
Would this address your feedback?
diff --git a/drivers/net/mdio/mdio-regmap.c b/drivers/net/mdio/mdio-regmap.c
index 2a0e9c519fa3..416ff4e13e8f 100644
--- a/drivers/net/mdio/mdio-regmap.c
+++ b/drivers/net/mdio/mdio-regmap.c
@@ -67,8 +67,15 @@ struct mii_bus *devm_mdio_regmap_register(struct device *dev,
mr = mii->priv;
mr->regmap = config->regmap;
mr->valid_addr = config->valid_addr;
- if (config->resource)
+ if (config->resource) {
+ if (config->resource->start > U32_MAX ||
+ config->resource->end > U32_MAX) {
+ dev_err(config->parent,
+ "Resource exceeds regmap API addressing possibilities\n");
+ return ERR_PTR(-EINVAL);
+ }
mr->base = config->resource->start;
+ }
mii->name = DRV_NAME;
strscpy(mii->id, config->name, MII_BUS_ID_SIZE);
(needs to be replicated in a bunch of other places)