linux-kernel - [PATCH] bus: qcom: Put child node before return

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Date:   Thu, 21 Jan 2021 03:49:07 -0800
From:   Pan Bian <bianpan2016@....com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: [PATCH] bus: qcom: Put child node before return

Put child node before return to fix potential reference count leak.
Generally, the reference count of child is incremented and decremented
automatically in the macro for_each_available_child_of_node() and should
be decremented manually if the loop is broken in loop body.

Fixes: 335a12754808 ("bus: qcom: add EBI2 driver")
Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/bus/qcom-ebi2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/qcom-ebi2.c b/drivers/bus/qcom-ebi2.c
index 03ddcf426887..0b8f53a688b8 100644
--- a/drivers/bus/qcom-ebi2.c
+++ b/drivers/bus/qcom-ebi2.c
@@ -353,8 +353,10 @@ static int qcom_ebi2_probe(struct platform_device *pdev)
 
 		/* Figure out the chipselect */
 		ret = of_property_read_u32(child, "reg", &csindex);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			return ret;
+		}
 
 		if (csindex > 5) {
 			dev_err(dev,
-- 
2.17.1