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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 WilczyĆski <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, ¶m, 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, ¶m, 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, ¶m, 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
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