From: Li Ming Date: Fri, 29 Nov 2024 13:28:25 +0000 (+0800) Subject: cxl/pci: Check dport->regs.rcd_pcie_cap availability before accessing X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=09ceba3a93450b652ae6910b6f65be99885f4437;p=users%2Fjedix%2Flinux-maple.git cxl/pci: Check dport->regs.rcd_pcie_cap availability before accessing RCD Upstream Port's PCI Express Capability is a component registers block stored in RCD Upstream Port RCRB. CXL PCI driver helps to map it during the RCD probing, but mapping failure is allowed for component registers blocks in CXL PCI driver. dport->regs.rcd_pcie_cap is used to store the virtual address of the RCD Upstream Port's PCI Express Capability, add a dport->regs.rcd_pcie_cap checking in rcd_pcie_cap_emit() just in case user accesses a invalid address via RCD sysfs. Fixes: c5eaec79fa43 ("cxl/pci: Add sysfs attribute for CXL 1.1 device link status") Signed-off-by: Li Ming Reviewed-by: Alison Schofield Reviewed-by: Dan Williams Link: https://patch.msgid.link/20241129132825.569237-1-ming.li@zohomail.com Signed-off-by: Dave Jiang --- diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 26ab06c9deff..6d94ff4a4f1a 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -836,6 +836,9 @@ static ssize_t rcd_pcie_cap_emit(struct device *dev, u16 offset, char *buf, size if (!root_dev) return -ENXIO; + if (!dport->regs.rcd_pcie_cap) + return -ENXIO; + guard(device)(root_dev); if (!root_dev->driver) return -ENXIO;