linux-kernel - [PATCH v2] memory: fsl_ifc: fix leak of irq and nand_irq in fsl_ifc_ctrl

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Message-Id: <20210925151434.8170-1-mudongliangabcd@gmail.com>
Date:   Sat, 25 Sep 2021 23:14:32 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Prabhakar Kushwaha <prabhakar@...escale.com>
Cc:     Dongliang Mu <mudongliangabcd@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] memory: fsl_ifc: fix leak of irq and nand_irq in fsl_ifc_ctrl_probe

The error handling code of fsl_ifc_ctrl_probe is problematic. When
fsl_ifc_ctrl_init fails or request_irq of fsl_ifc_ctrl_dev->irq fails,
it forgets to free the irq and nand_irq. Meanwhile, if request_irq of
fsl_ifc_ctrl_dev->nand_irq fails, it will still free nand_irq even if
the request_irq is not successful.

Fix this by refactoring the error handling code

Fixes: d2ae2e20fbdd ("driver/memory:Move Freescale IFC driver to a common driver")
Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
---
v1->v2: remove the check of nand_irq; add fixes tag;
 drivers/memory/fsl_ifc.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/memory/fsl_ifc.c b/drivers/memory/fsl_ifc.c
index d062c2f8250f..75a8c38df939 100644
--- a/drivers/memory/fsl_ifc.c
+++ b/drivers/memory/fsl_ifc.c
@@ -263,7 +263,7 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 
 	ret = fsl_ifc_ctrl_init(fsl_ifc_ctrl_dev);
 	if (ret < 0)
-		goto err;
+		goto err_unmap_nandirq;
 
 	init_waitqueue_head(&fsl_ifc_ctrl_dev->nand_wait);
 
@@ -272,7 +272,7 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 	if (ret != 0) {
 		dev_err(&dev->dev, "failed to install irq (%d)\n",
 			fsl_ifc_ctrl_dev->irq);
-		goto err_irq;
+		goto err_unmap_nandirq;
 	}
 
 	if (fsl_ifc_ctrl_dev->nand_irq) {
@@ -281,17 +281,16 @@ static int fsl_ifc_ctrl_probe(struct platform_device *dev)
 		if (ret != 0) {
 			dev_err(&dev->dev, "failed to install irq (%d)\n",
 				fsl_ifc_ctrl_dev->nand_irq);
-			goto err_nandirq;
+			goto err_free_irq;
 		}
 	}
 
 	return 0;
 
-err_nandirq:
-	free_irq(fsl_ifc_ctrl_dev->nand_irq, fsl_ifc_ctrl_dev);
-	irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq);
-err_irq:
+err_free_irq:
 	free_irq(fsl_ifc_ctrl_dev->irq, fsl_ifc_ctrl_dev);
+err_unmap_nandirq:
+	irq_dispose_mapping(fsl_ifc_ctrl_dev->nand_irq);
 	irq_dispose_mapping(fsl_ifc_ctrl_dev->irq);
 err:
 	iounmap(fsl_ifc_ctrl_dev->gregs);
-- 
2.25.1