linux-kernel - [PATCH] Regulator - Fix possible NULL derefrence.

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Date:   Mon, 30 Jan 2017 10:23:07 +0530
From:   Shailendra Verma <shailendra.v@...sung.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        p.shailesh@...sung.com, ashish.kalra@...sung.com,
        Shailendra Verma <shailendra.v@...sung.com>,
        Shailendra Verma <shailendra.capricorn@...il.com>
Subject: [PATCH] Regulator - Fix possible NULL derefrence.

of_match_device could return NULL, and so can cause a NULL
pointer dereference later.

Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
---
 drivers/regulator/qcom_rpm-regulator.c |    4 ++++
 drivers/regulator/qcom_smd-regulator.c |    4 ++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/regulator/qcom_rpm-regulator.c b/drivers/regulator/qcom_rpm-regulator.c
index 1b2acc4..8a03db8 100644
--- a/drivers/regulator/qcom_rpm-regulator.c
+++ b/drivers/regulator/qcom_rpm-regulator.c
@@ -959,6 +959,10 @@ static int rpm_reg_probe(struct platform_device *pdev)
 	}
 
 	match = of_match_device(rpm_of_match, &pdev->dev);
+	if (!match) {
+		dev_err(&pdev->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
 	for (reg = match->data; reg->name; reg++) {
 		vreg = devm_kmalloc(&pdev->dev, sizeof(*vreg), GFP_KERNEL);
 		if (!vreg)
diff --git a/drivers/regulator/qcom_smd-regulator.c b/drivers/regulator/qcom_smd-regulator.c
index 8ed46a9..967f2b6 100644
--- a/drivers/regulator/qcom_smd-regulator.c
+++ b/drivers/regulator/qcom_smd-regulator.c
@@ -468,6 +468,10 @@ static int rpm_reg_probe(struct platform_device *pdev)
 	}
 
 	match = of_match_device(rpm_of_match, &pdev->dev);
+	if (!match) {
+		dev_err(&pdev->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
 	for (reg = match->data; reg->name; reg++) {
 		vreg = devm_kzalloc(&pdev->dev, sizeof(*vreg), GFP_KERNEL);
 		if (!vreg)
-- 
1.7.9.5