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

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Message-Id: <20230419-dynamic-vmon-v4-1-4d3734e62ada@skidata.com>
Date:   Tue, 20 Jun 2023 22:02:54 +0200
From:   Benjamin Bara <bbara93@...il.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     support.opensource@...semi.com,
        DLG-Adam.Ward.opensource@...renesas.com,
        Martin Fuzzey <martin.fuzzey@...wbird.group>,
        linux-kernel@...r.kernel.org,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Benjamin Bara <benjamin.bara@...data.com>
Subject: [PATCH RFC v4 01/13] regulator: da9063: fix null pointer deref
 with partial DT config

From: Benjamin Bara <benjamin.bara@...data.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@...wbird.group>
Closes: https://lore.kernel.org/all/20230616143736.2946173-1-martin.fuzzey@flowbird.group/
Signed-off-by: Benjamin Bara <benjamin.bara@...data.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