linux-kernel - [PATCH] soc: realview: fix two memleaks in realview_soc

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Date:   Thu,  7 Dec 2023 20:19:31 +0800
From:   Zhipeng Lu <alexious@....edu.cn>
To:     alexious@....edu.cn
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] soc: realview: fix two memleaks in realview_soc_probe

When of_property_read_string fails, it should free soc_dev_attr
allocated by kzalloc before. So as the failure of regmap_read, the
soc_dev needs to be unregistered and soc_dev_attr needs to be freed.

Fixes: a2974c9c1f83 ("soc: add driver for the ARM RealView")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
---
 drivers/soc/versatile/soc-realview.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/versatile/soc-realview.c b/drivers/soc/versatile/soc-realview.c
index c6876d232d8f..19c4a9599c9f 100644
--- a/drivers/soc/versatile/soc-realview.c
+++ b/drivers/soc/versatile/soc-realview.c
@@ -99,8 +99,10 @@ static int realview_soc_probe(struct platform_device *pdev)
 
 	ret = of_property_read_string(np, "compatible",
 				      &soc_dev_attr->soc_id);
-	if (ret)
+	if (ret) {
+		kfree(soc_dev_attr);
 		return -EINVAL;
+	}
 
 	soc_dev_attr->machine = "RealView";
 	soc_dev_attr->family = "Versatile";
@@ -112,9 +114,11 @@ static int realview_soc_probe(struct platform_device *pdev)
 	}
 	ret = regmap_read(syscon_regmap, REALVIEW_SYS_ID_OFFSET,
 			  &realview_coreid);
-	if (ret)
+	if (ret) {
+		soc_device_unregister(soc_dev);
+		kfree(soc_dev_attr);
 		return -ENODEV;
-
+	}
 	dev_info(&pdev->dev, "RealView Syscon Core ID: 0x%08x, HBI-%03x\n",
 		 realview_coreid,
 		 ((realview_coreid >> 16) & 0xfff));
-- 
2.34.1