[PATCH v3 8/9] leds: st1202: validate LED reg property against channel count

[Manuel Fombuena]

The reg property from the device tree is used directly as an array index
into chip->leds[] without bounds checking. A value >= ST1202_MAX_LEDS
would cause an out-of-bounds write during probe.

Fixes: 259230378c65 ("leds: Add LED1202 I2C driver")
Signed-off-by: Manuel Fombuena <fombuena@xxxxxxxxxxx>
Assisted-by: Claude:claude-sonnet-4-6
---
 drivers/leds/leds-st1202.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/leds/leds-st1202.c b/drivers/leds/leds-st1202.c
index 7413d316d857..d1fadbaac127 100644
--- a/drivers/leds/leds-st1202.c
+++ b/drivers/leds/leds-st1202.c
@@ -289,6 +289,11 @@ static int st1202_dt_init(struct st1202_chip *chip)
 		if (err)
 			return dev_err_probe(dev, err, "Invalid register\n");
 
+		if (reg >= ST1202_MAX_LEDS)
+			return dev_err_probe(dev, -EINVAL,
+					"LED reg %u out of range [0, %d]\n",
+					reg, ST1202_MAX_LEDS - 1);
+
 		led = &chip->leds[reg];
 		led->is_active = true;
 		led->fwnode = of_fwnode_handle(child);
-- 
2.54.0