[PATCH RFC v4 01/13] regulator: da9063: fix null pointer deref with partial DT config

[Benjamin Bara <bbara93@gmail.com>]

From: Benjamin Bara <benjamin.bara@skidata.com>

Skip checking the XVP constraints if the regulator has no DT node.
This fixes a null pointer dereference.

Fixes: b8717a80e6ee ("regulator: da9063: implement setter for voltage monitoring")
Reported-by: Martin Fuzzey <martin.fuzzey@flowbird.group>
Closes: https://lore.kernel.org/all/20230616143736.2946173-1-martin.fuzzey@flowbird.group/
Signed-off-by: Benjamin Bara <benjamin.bara@skidata.com>
---
 drivers/regulator/da9063-regulator.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/da9063-regulator.c b/drivers/regulator/da9063-regulator.c
index c5dd77be558b..308ad63fcf78 100644
--- a/drivers/regulator/da9063-regulator.c
+++ b/drivers/regulator/da9063-regulator.c
@@ -1028,9 +1028,12 @@ static int da9063_regulator_probe(struct platform_device *pdev)
 			config.of_node = da9063_reg_matches[id].of_node;
 		config.regmap = da9063->regmap;
 
-		ret = da9063_check_xvp_constraints(&config);
-		if (ret)
-			return ret;
+		/* Only check constraints if DT node is available. */
+		if (config.init_data) {
+			ret = da9063_check_xvp_constraints(&config);
+			if (ret)
+				return ret;
+		}
 
 		regl->rdev = devm_regulator_register(&pdev->dev, &regl->desc,
 						     &config);

-- 
2.34.1