From: Kangjie Lu kjlu@umn.edu
[ Upstream commit 699ca30162686bf305cdf94861be02eb0cf9bda2 ]
If __get_free_pages() fails, return -ENOMEM to avoid a NULL pointer dereference.
Signed-off-by: Kangjie Lu kjlu@umn.edu Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Reviewed-by: Steven Price steven.price@arm.com Reviewed-by: Mukesh Ojha mojha@codeaurora.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/host/pcie-xilinx.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/host/pcie-xilinx.c b/drivers/pci/host/pcie-xilinx.c index 4cfa46360d122..6a2499f4d6109 100644 --- a/drivers/pci/host/pcie-xilinx.c +++ b/drivers/pci/host/pcie-xilinx.c @@ -349,14 +349,19 @@ static const struct irq_domain_ops msi_domain_ops = { * xilinx_pcie_enable_msi - Enable MSI support * @port: PCIe port information */ -static void xilinx_pcie_enable_msi(struct xilinx_pcie_port *port) +static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port) { phys_addr_t msg_addr;
port->msi_pages = __get_free_pages(GFP_KERNEL, 0); + if (!port->msi_pages) + return -ENOMEM; + msg_addr = virt_to_phys((void *)port->msi_pages); pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1); pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2); + + return 0; }
/* INTx Functions */ @@ -555,6 +560,7 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port) struct device *dev = port->dev; struct device_node *node = dev->of_node; struct device_node *pcie_intc_node; + int ret;
/* Setup INTx */ pcie_intc_node = of_get_next_child(node, NULL); @@ -582,7 +588,9 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port) return PTR_ERR(port->irq_domain); }
- xilinx_pcie_enable_msi(port); + ret = xilinx_pcie_enable_msi(port); + if (ret) + return ret; }
return 0;