From: Gabriele Paoloni Date: Thu, 8 Oct 2015 19:27:53 +0000 (-0500) Subject: PCI: designware: Require config accesses to be naturally aligned X-Git-Tag: firefly_0821_release~176^2~768^2~2^3~7 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b6b18f589e1ddbfbc31f72ea7fb8a723a2d10058;p=firefly-linux-kernel-4.4.55.git PCI: designware: Require config accesses to be naturally aligned Add sanity checks on "addr" input parameter in dw_pcie_cfg_read() and dw_pcie_cfg_write(). These checks make sure that accesses are aligned on their size, e.g., a 4-byte config access is aligned on a 4-byte boundary. [bhelgaas: changelog, set *val = 0 in failure case] Signed-off-by: Gabriele Paoloni Signed-off-by: Bjorn Helgaas Acked-by: Pratyush Anand --- diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c index 759cd0a50910..b77535f3967b 100644 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -82,6 +82,11 @@ static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys) int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val) { + if ((uintptr_t)addr & (size - 1)) { + *val = 0; + return PCIBIOS_BAD_REGISTER_NUMBER; + } + if (size == 4) *val = readl(addr); else if (size == 2) @@ -98,6 +103,9 @@ int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val) int dw_pcie_cfg_write(void __iomem *addr, int size, u32 val) { + if ((uintptr_t)addr & (size - 1)) + return PCIBIOS_BAD_REGISTER_NUMBER; + if (size == 4) writel(val, addr); else if (size == 2)