linux-kernel - [PATCH] rtc: Fix memleak in sun6i_rtc_clk

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Message-Id: <1605327501-15110-1-git-send-email-tangyouling@loongson.cn>
Date:   Sat, 14 Nov 2020 12:18:21 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] rtc: Fix memleak in sun6i_rtc_clk_init

When rtc->base or rtc->int_osc or rtc->losc or rtc->ext_losc is NULL,
we should free clk_data and rtc before the function returns to prevent
memleak.

Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
---
 drivers/rtc/rtc-sun6i.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
index e2b8b15..84ff1e6 100644
--- a/drivers/rtc/rtc-sun6i.c
+++ b/drivers/rtc/rtc-sun6i.c
@@ -272,7 +272,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 								300000000);
 	if (IS_ERR(rtc->int_osc)) {
 		pr_crit("Couldn't register the internal oscillator\n");
-		return;
+		goto err;
 	}
 
 	parents[0] = clk_hw_get_name(rtc->int_osc);
@@ -290,7 +290,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 	rtc->losc = clk_register(NULL, &rtc->hw);
 	if (IS_ERR(rtc->losc)) {
 		pr_crit("Couldn't register the LOSC clock\n");
-		return;
+		goto err;
 	}
 
 	of_property_read_string_index(node, "clock-output-names", 1,
@@ -301,7 +301,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 					  &rtc->lock);
 	if (IS_ERR(rtc->ext_losc)) {
 		pr_crit("Couldn't register the LOSC external gate\n");
-		return;
+		goto err;
 	}
 
 	clk_data->num = 2;
@@ -316,6 +316,7 @@ static void __init sun6i_rtc_clk_init(struct device_node *node,
 
 err:
 	kfree(clk_data);
+	kfree(rtc);
 }
 
 static const struct sun6i_rtc_clk_data sun6i_a31_rtc_data = {
-- 
2.1.0