linux-kernel - [PATCH] usb: fotg210-udc: fix potential memory leak in fotg210_udc

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Date:   Wed, 30 Nov 2022 18:12:51 +0800
From:   Yi Yang <yiyang13@...wei.com>
To:     <linus.walleij@...aro.org>, <gregkh@...uxfoundation.org>,
        <yiyang13@...wei.com>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] usb: fotg210-udc: fix potential memory leak in fotg210_udc_probe()

In fotg210_udc_probe(), if devm_clk_get() or clk_prepare_enable()
fails, 'fotg210' will not be freed, which will lead to a memory leak.
Fix it by moving kfree() to a proper location.

Fixes: 718a38d092ec ("fotg210-udc: Handle PCLK")
Signed-off-by: Yi Yang <yiyang13@...wei.com>
---
 drivers/usb/fotg210/fotg210-udc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/fotg210/fotg210-udc.c b/drivers/usb/fotg210/fotg210-udc.c
index b9ea6c6d931c..a366d69c1818 100644
--- a/drivers/usb/fotg210/fotg210-udc.c
+++ b/drivers/usb/fotg210/fotg210-udc.c
@@ -1178,7 +1178,7 @@ int fotg210_udc_probe(struct platform_device *pdev)
 		ret = clk_prepare_enable(fotg210->pclk);
 		if (ret) {
 			dev_err(dev, "failed to enable PCLK\n");
-			return ret;
+			goto err;
 		}
 	} else if (PTR_ERR(fotg210->pclk) == -EPROBE_DEFER) {
 		/*
@@ -1302,8 +1302,7 @@ int fotg210_udc_probe(struct platform_device *pdev)
 	if (!IS_ERR(fotg210->pclk))
 		clk_disable_unprepare(fotg210->pclk);
 
-	kfree(fotg210);
-
 err:
+	kfree(fotg210);
 	return ret;
 }
-- 
2.17.1