Re: [v2, 2/3] powerpc/powernv: Add sanity checks to pnv_pci_get_{gpu|npu}_dev
On Mon, 2017-04-03 at 09:51:43 UTC, Alistair Popple wrote: > The pnv_pci_get_{gpu|npu}_dev functions are used to find associations > between nvlink PCIe devices and standard PCIe devices. However they > lacked basic sanity checking which results in NULL pointer > dereferencing if they are incorrect called can be harder to spot than > an explicit WARN_ON. > > Signed-off-by: Alistair PoppleApplied to powerpc next, thanks. https://git.kernel.org/powerpc/c/4c3b89effc281704d5395282c800c4 cheers
Re: [v2, 2/3] powerpc/powernv: Add sanity checks to pnv_pci_get_{gpu|npu}_dev
On Mon, 2017-04-03 at 09:51:43 UTC, Alistair Popple wrote: > The pnv_pci_get_{gpu|npu}_dev functions are used to find associations > between nvlink PCIe devices and standard PCIe devices. However they > lacked basic sanity checking which results in NULL pointer > dereferencing if they are incorrect called can be harder to spot than > an explicit WARN_ON. > > Signed-off-by: Alistair Popple Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/4c3b89effc281704d5395282c800c4 cheers
[PATCH v2 2/3] powerpc/powernv: Add sanity checks to pnv_pci_get_{gpu|npu}_dev
The pnv_pci_get_{gpu|npu}_dev functions are used to find associations between nvlink PCIe devices and standard PCIe devices. However they lacked basic sanity checking which results in NULL pointer dereferencing if they are incorrect called can be harder to spot than an explicit WARN_ON. Signed-off-by: Alistair Popple--- arch/powerpc/platforms/powernv/npu-dma.c | 12 1 file changed, 12 insertions(+) diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c index 1c383f3..050bd5d 100644 --- a/arch/powerpc/platforms/powernv/npu-dma.c +++ b/arch/powerpc/platforms/powernv/npu-dma.c @@ -37,6 +37,12 @@ struct pci_dev *pnv_pci_get_gpu_dev(struct pci_dev *npdev) struct device_node *dn; struct pci_dev *gpdev; + if (WARN_ON(!npdev)) + return NULL; + + if (WARN_ON(!npdev->dev.of_node)) + return NULL; + /* Get assoicated PCI device */ dn = of_parse_phandle(npdev->dev.of_node, "ibm,gpu", 0); if (!dn) @@ -55,6 +61,12 @@ struct pci_dev *pnv_pci_get_npu_dev(struct pci_dev *gpdev, int index) struct device_node *dn; struct pci_dev *npdev; + if (WARN_ON(!gpdev)) + return NULL; + + if (WARN_ON(!gpdev->dev.of_node)) + return NULL; + /* Get assoicated PCI device */ dn = of_parse_phandle(gpdev->dev.of_node, "ibm,npu", index); if (!dn) -- 2.1.4
[PATCH v2 2/3] powerpc/powernv: Add sanity checks to pnv_pci_get_{gpu|npu}_dev
The pnv_pci_get_{gpu|npu}_dev functions are used to find associations between nvlink PCIe devices and standard PCIe devices. However they lacked basic sanity checking which results in NULL pointer dereferencing if they are incorrect called can be harder to spot than an explicit WARN_ON. Signed-off-by: Alistair Popple --- arch/powerpc/platforms/powernv/npu-dma.c | 12 1 file changed, 12 insertions(+) diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c index 1c383f3..050bd5d 100644 --- a/arch/powerpc/platforms/powernv/npu-dma.c +++ b/arch/powerpc/platforms/powernv/npu-dma.c @@ -37,6 +37,12 @@ struct pci_dev *pnv_pci_get_gpu_dev(struct pci_dev *npdev) struct device_node *dn; struct pci_dev *gpdev; + if (WARN_ON(!npdev)) + return NULL; + + if (WARN_ON(!npdev->dev.of_node)) + return NULL; + /* Get assoicated PCI device */ dn = of_parse_phandle(npdev->dev.of_node, "ibm,gpu", 0); if (!dn) @@ -55,6 +61,12 @@ struct pci_dev *pnv_pci_get_npu_dev(struct pci_dev *gpdev, int index) struct device_node *dn; struct pci_dev *npdev; + if (WARN_ON(!gpdev)) + return NULL; + + if (WARN_ON(!gpdev->dev.of_node)) + return NULL; + /* Get assoicated PCI device */ dn = of_parse_phandle(gpdev->dev.of_node, "ibm,npu", index); if (!dn) -- 2.1.4