[PATCH] pinctrl: spacemit: validate pins in pinconf callbacks

[PATCH] pinctrl: spacemit: validate pins in pinconf callbacks

[Troy Mitchell]

Pin 0 is a valid pin ID, but spacemit_pinconf_get() rejects it by
testing the numeric ID rather than the result of the descriptor lookup.
It also fails to reject nonzero IDs absent from the SoC pin table before
computing their register addresses. Check the descriptor and use its pin
ID for the register lookup.

spacemit_pinconf_group_set() validates only the first group member when
generating the configuration. If a later member is invalid,
spacemit_pin_set_config() returns -EINVAL, but the callback ignores it
and reports success after partially updating the group.

Validate every group member before writing any registers so malformed
groups fail without being partially applied.

Fixes: a83c29e1d145 ("pinctrl: spacemit: add support for SpacemiT K1 SoC")
Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
---
 drivers/pinctrl/spacemit/pinctrl-k1.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/spacemit/pinctrl-k1.c b/drivers/pinctrl/spacemit/pinctrl-k1.c
index f0b5ebd9e223..c3a7538783b8 100644
--- a/drivers/pinctrl/spacemit/pinctrl-k1.c
+++ b/drivers/pinctrl/spacemit/pinctrl-k1.c
@@ -503,13 +503,14 @@ static int spacemit_pinconf_get(struct pinctrl_dev *pctldev,
 				unsigned int pin, unsigned long *config)
 {
 	struct spacemit_pinctrl *pctrl = pinctrl_dev_get_drvdata(pctldev);
+	const struct spacemit_pin *spin = spacemit_get_pin(pctrl, pin);
 	int param = pinconf_to_config_param(*config);
 	u32 value, arg = 0;
 
-	if (!pin)
+	if (!spin)
 		return -EINVAL;
 
-	value = readl(spacemit_pin_to_reg(pctrl, pin));
+	value = readl(spacemit_pin_to_reg(pctrl, spin->pin));
 
 	switch (param) {
 	case PIN_CONFIG_SLEW_RATE:
@@ -689,6 +690,11 @@ static int spacemit_pinconf_group_set(struct pinctrl_dev *pctldev,
 	if (ret)
 		return ret;
 
+	for (i = 0; i < group->grp.npins; i++) {
+		if (!spacemit_get_pin(pctrl, group->grp.pins[i]))
+			return -EINVAL;
+	}
+
 	for (i = 0; i < group->grp.npins; i++)
 		spacemit_pin_set_config(pctrl, group->grp.pins[i], value);
 

---
base-commit: f5098b6bae761e346ebcd9da7f95622c04733cff
change-id: 20260729-spacemit-pinconf-validation-fixes-fa5a0ec885d6

Best regards,
--  
Troy Mitchell <troy.mitchell@linux.spacemit.com>

Re: [PATCH] pinctrl: spacemit: validate pins in pinconf callbacks

[Yixun Lan]

Hi Troy,

On 02:26 Wed 29 Jul     , Troy Mitchell wrote:
> Pin 0 is a valid pin ID, but spacemit_pinconf_get() rejects it by
> testing the numeric ID rather than the result of the descriptor lookup.
> It also fails to reject nonzero IDs absent from the SoC pin table before
> computing their register addresses. Check the descriptor and use its pin
> ID for the register lookup.
> 
> spacemit_pinconf_group_set() validates only the first group member when
> generating the configuration. If a later member is invalid,
> spacemit_pin_set_config() returns -EINVAL, but the callback ignores it
> and reports success after partially updating the group.
> 
> Validate every group member before writing any registers so malformed
> groups fail without being partially applied.
> 
> Fixes: a83c29e1d145 ("pinctrl: spacemit: add support for SpacemiT K1 SoC")
> Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
The fix looks good to me, thanks

Reviewed-by: Yixun Lan <dlan@kernel.org>

-- 
Yixun Lan (dlan)