linux-kernel - [PATCH 2/3] mmc: sunlpus: Fix a memory leak in case of error in spmmc_drv

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Date:   Sat, 10 Dec 2022 19:36:38 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Tony Huang <tonyhuang.sunplus@...il.com>,
        Li-hao Kuo <lhjeff911@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-mmc@...r.kernel.org
Subject: [PATCH 2/3] mmc: sunlpus: Fix a memory leak in case of error in spmmc_drv_probe()

If an error occurs after a successful mmc_alloc_host() call in the probe,
the error handling path should be executed in order to call
mmc_free_host().

Fixes: 4e268fed8b18 ("mmc: Add mmc driver for Sunplus SP7021")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/mmc/host/sunplus-mmc.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/host/sunplus-mmc.c b/drivers/mmc/host/sunplus-mmc.c
index 3e8856a82188..ed789a9bdd23 100644
--- a/drivers/mmc/host/sunplus-mmc.c
+++ b/drivers/mmc/host/sunplus-mmc.c
@@ -875,26 +875,34 @@ static int spmmc_drv_probe(struct platform_device *pdev)
 	host->dma_int_threshold = 1024;
 
 	host->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
-	if (IS_ERR(host->base))
-		return PTR_ERR(host->base);
+	if (IS_ERR(host->base)) {
+		ret = PTR_ERR(host->base);
+		goto probe_free_host;
+	}
 
 	host->clk = devm_clk_get_enabled(&pdev->dev, NULL);
-	if (IS_ERR(host->clk))
-		return dev_err_probe(&pdev->dev, PTR_ERR(host->clk), "clk get fail\n");
+	if (IS_ERR(host->clk)) {
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(host->clk), "clk get fail\n");
+		goto probe_free_host;
+	}
 
 	host->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
-	if (IS_ERR(host->rstc))
-		return dev_err_probe(&pdev->dev, PTR_ERR(host->rstc), "rst get fail\n");
+	if (IS_ERR(host->rstc)) {
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(host->rstc), "rst get fail\n");
+		goto probe_free_host;
+	}
 
 	host->irq = platform_get_irq(pdev, 0);
-	if (host->irq <= 0)
-		return host->irq;
+	if (host->irq <= 0) {
+		ret = host->irq;
+		goto probe_free_host;
+	}
 
 	ret = devm_request_threaded_irq(&pdev->dev, host->irq,
 					spmmc_irq, spmmc_func_finish_req, IRQF_SHARED,
 			NULL, host);
 	if (ret)
-		return ret;
+		goto probe_free_host;
 
 	ret = mmc_of_parse(mmc);
 	if (ret)
-- 
2.34.1