linux-kernel - [PATCH v5] soc: qcom: apr: Add check for idr_alloc and of_property_read_string

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Date:   Fri,  7 Oct 2022 11:32:40 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     andersson@...nel.org
Cc:     quic_jjohnson@...cinc.com, agross@...nel.org,
        bjorn.andersson@...aro.org, konrad.dybcio@...ainline.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v5] soc: qcom: apr: Add check for idr_alloc and of_property_read_string_index

As idr_alloc() and of_property_read_string_index() can return negative
numbers, it should be better to check the return value and deal with
the exception.
Therefore, it should be better to use goto statement to stop and return
error.

Fixes: 6adba21eb434 ("soc: qcom: Add APR bus driver")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Changelog:

v4 -> v5:

1. Change dev_err and goto statements.

v3 -> v4:

1. Change the title and remove the kfree.

v2 -> v3:

1. Change the title and use goto statement to deal with the exception.

v1 -> v2:

1. Add dev_err and put_device in order to maintain the code consistency.
---
 drivers/soc/qcom/apr.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/qcom/apr.c b/drivers/soc/qcom/apr.c
index b4046f393575..a942c8a8dde2 100644
--- a/drivers/soc/qcom/apr.c
+++ b/drivers/soc/qcom/apr.c
@@ -454,11 +454,21 @@ static int apr_add_device(struct device *dev, struct device_node *np,
 	adev->dev.driver = NULL;
 
 	spin_lock(&apr->svcs_lock);
-	idr_alloc(&apr->svcs_idr, svc, svc_id, svc_id + 1, GFP_ATOMIC);
+	ret = idr_alloc(&apr->svcs_idr, svc, svc_id, svc_id + 1, GFP_ATOMIC);
 	spin_unlock(&apr->svcs_lock);
+	if (ret < 0) {
+		dev_err(dev, "idr_alloc failed: %d\n", ret);
+		put_device(&adev->dev);
+		goto out;
+	}
 
-	of_property_read_string_index(np, "qcom,protection-domain",
-				      1, &adev->service_path);
+	ret = of_property_read_string_index(np, "qcom,protection-domain",
+					    1, &adev->service_path);
+	if (ret < 0) {
+		dev_err(dev, "Failed to read second value of qcom,protection-domain\n");
+		put_device(&adev->dev);
+		goto out;
+	}
 
 	dev_info(dev, "Adding APR/GPR dev: %s\n", dev_name(&adev->dev));
 
@@ -468,6 +478,7 @@ static int apr_add_device(struct device *dev, struct device_node *np,
 		put_device(&adev->dev);
 	}
 
+out:
 	return ret;
 }
 
-- 
2.25.1