From: Zhenzhong Duan <zhenzhong.duan@gmail.com> mainline inclusion from mainline-v5.11-rc1 commit 1f40704bb01b9fba9925006662a37373d514f26b category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/15817 CVE: CVE-2026-53120 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- Move pci_match_device() and its dependencies (pci_match_id() and pci_device_id_any) ahead of new_id_store(). This is preparation work for calling pci_match_device() in new_id_store(). No functional changes. [bhelgaas: update function comments] Link: https://lore.kernel.org/r/20201117054409.3428-2-zhenzhong.duan@gmail.com Signed-off-by: Zhenzhong Duan <zhenzhong.duan@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Ziming Du <duziming2@huawei.com> --- drivers/pci/pci-driver.c | 145 ++++++++++++++++++++------------------- 1 file changed, 73 insertions(+), 72 deletions(-) diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 986bb53b60c9d..172ae44f164b2 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -89,6 +89,79 @@ static void pci_free_dynids(struct pci_driver *drv) spin_unlock(&drv->dynids.lock); } +/** + * pci_match_id - See if a PCI device matches a given pci_id table + * @ids: array of PCI device ID structures to search in + * @dev: the PCI device structure to match against. + * + * Used by a driver to check whether a PCI device is in its list of + * supported devices. Returns the matching pci_device_id structure or + * %NULL if there is no match. + * + * Deprecated; don't use this as it will not catch any dynamic IDs + * that a driver might want to check for. + */ +const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, + struct pci_dev *dev) +{ + if (ids) { + while (ids->vendor || ids->subvendor || ids->class_mask) { + if (pci_match_one_device(ids, dev)) + return ids; + ids++; + } + } + return NULL; +} +EXPORT_SYMBOL(pci_match_id); + +static const struct pci_device_id pci_device_id_any = { + .vendor = PCI_ANY_ID, + .device = PCI_ANY_ID, + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, +}; + +/** + * pci_match_device - See if a device matches a driver's list of IDs + * @drv: the PCI driver to match against + * @dev: the PCI device structure to match against + * + * Used by a driver to check whether a PCI device is in its list of + * supported devices or in the dynids list, which may have been augmented + * via the sysfs "new_id" file. Returns the matching pci_device_id + * structure or %NULL if there is no match. + */ +static const struct pci_device_id *pci_match_device(struct pci_driver *drv, + struct pci_dev *dev) +{ + struct pci_dynid *dynid; + const struct pci_device_id *found_id = NULL; + + /* When driver_override is set, only bind to the matching driver */ + if (dev->driver_override && strcmp(dev->driver_override, drv->name)) + return NULL; + + /* Look at the dynamic ids first, before the static ones */ + spin_lock(&drv->dynids.lock); + list_for_each_entry(dynid, &drv->dynids.list, node) { + if (pci_match_one_device(&dynid->id, dev)) { + found_id = &dynid->id; + break; + } + } + spin_unlock(&drv->dynids.lock); + + if (!found_id) + found_id = pci_match_id(drv->id_table, dev); + + /* driver_override will always match, send a dummy id */ + if (!found_id && dev->driver_override) + found_id = &pci_device_id_any; + + return found_id; +} + /** * store_new_id - sysfs frontend to pci_add_dynid() * @driver: target device driver @@ -208,78 +281,6 @@ static struct attribute *pci_drv_attrs[] = { }; ATTRIBUTE_GROUPS(pci_drv); -/** - * pci_match_id - See if a pci device matches a given pci_id table - * @ids: array of PCI device id structures to search in - * @dev: the PCI device structure to match against. - * - * Used by a driver to check whether a PCI device present in the - * system is in its list of supported devices. Returns the matching - * pci_device_id structure or %NULL if there is no match. - * - * Deprecated, don't use this as it will not catch any dynamic ids - * that a driver might want to check for. - */ -const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, - struct pci_dev *dev) -{ - if (ids) { - while (ids->vendor || ids->subvendor || ids->class_mask) { - if (pci_match_one_device(ids, dev)) - return ids; - ids++; - } - } - return NULL; -} -EXPORT_SYMBOL(pci_match_id); - -static const struct pci_device_id pci_device_id_any = { - .vendor = PCI_ANY_ID, - .device = PCI_ANY_ID, - .subvendor = PCI_ANY_ID, - .subdevice = PCI_ANY_ID, -}; - -/** - * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure - * @drv: the PCI driver to match against - * @dev: the PCI device structure to match against - * - * Used by a driver to check whether a PCI device present in the - * system is in its list of supported devices. Returns the matching - * pci_device_id structure or %NULL if there is no match. - */ -static const struct pci_device_id *pci_match_device(struct pci_driver *drv, - struct pci_dev *dev) -{ - struct pci_dynid *dynid; - const struct pci_device_id *found_id = NULL; - - /* When driver_override is set, only bind to the matching driver */ - if (dev->driver_override && strcmp(dev->driver_override, drv->name)) - return NULL; - - /* Look at the dynamic ids first, before the static ones */ - spin_lock(&drv->dynids.lock); - list_for_each_entry(dynid, &drv->dynids.list, node) { - if (pci_match_one_device(&dynid->id, dev)) { - found_id = &dynid->id; - break; - } - } - spin_unlock(&drv->dynids.lock); - - if (!found_id) - found_id = pci_match_id(drv->id_table, dev); - - /* driver_override will always match, send a dummy id */ - if (!found_id && dev->driver_override) - found_id = &pci_device_id_any; - - return found_id; -} - struct drv_dev_and_id { struct pci_driver *drv; struct pci_dev *dev; -- 2.43.0