linux-kernel - [RFC PATCH v2 1/2] misc: pci_endpoint_test: Aggregate params checking for xfer

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Message-Id: <20220906101555.106033-1-mie@igel.co.jp>
Date:   Tue,  6 Sep 2022 19:15:54 +0900
From:   Shunsuke Mie <mie@...l.co.jp>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Shunsuke Mie <mie@...l.co.jp>
Subject: [RFC PATCH v2 1/2] misc: pci_endpoint_test: Aggregate params checking for xfer

Each transfer test functions have same parameter checking code. This patch
unites those to an introduced function.

Signed-off-by: Shunsuke Mie <mie@...l.co.jp>
---
Changes in v2:
* New patch
---
---
 drivers/misc/pci_endpoint_test.c | 35 ++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 8f786a225dcf..3bd9f135cdac 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -332,6 +332,17 @@ static bool pci_endpoint_test_msi_irq(struct pci_endpoint_test *test,
 	return false;
 }
 
+static int pci_endpoint_test_validate_xfer_params(struct device *dev,
+		struct pci_endpoint_test_xfer_param *param, size_t alignment)
+{
+	if (param->size > SIZE_MAX - alignment) {
+		dev_err(dev, "Maximum transfer data size exceeded\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static bool pci_endpoint_test_copy(struct pci_endpoint_test *test,
 				   unsigned long arg)
 {
@@ -363,9 +374,13 @@ static bool pci_endpoint_test_copy(struct pci_endpoint_test *test,
 		return false;
 	}
 
+	err = pci_endpoint_test_validate_xfer_params(dev, &param, alignment);
+	if (err) {
+		dev_err(dev, "Invalid parameter\n");
+		return false;
+	}
+
 	size = param.size;
-	if (size > SIZE_MAX - alignment)
-		goto err;
 
 	use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA);
 	if (use_dma)
@@ -497,9 +512,13 @@ static bool pci_endpoint_test_write(struct pci_endpoint_test *test,
 		return false;
 	}
 
+	err = pci_endpoint_test_validate_xfer_params(dev, &param, alignment);
+	if (err) {
+		dev_err(dev, "Invalid parameter\n");
+		return false;
+	}
+
 	size = param.size;
-	if (size > SIZE_MAX - alignment)
-		goto err;
 
 	use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA);
 	if (use_dma)
@@ -595,9 +614,13 @@ static bool pci_endpoint_test_read(struct pci_endpoint_test *test,
 		return false;
 	}
 
+	err = pci_endpoint_test_validate_xfer_params(dev, &param, alignment);
+	if (err) {
+		dev_err(dev, "Invalid parameter\n");
+		return false;
+	}
+
 	size = param.size;
-	if (size > SIZE_MAX - alignment)
-		goto err;
 
 	use_dma = !!(param.flags & PCITEST_FLAGS_USE_DMA);
 	if (use_dma)
-- 
2.17.1