From: Andy Shevchenko andriy.shevchenko@linux.intel.com
stable inclusion from stable-v5.10.231 commit 49de4ac804275fadd93b0b58e73e7491ef833bcd category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEADX CVE: CVE-2024-53237
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 82b070beae1ef55b0049768c8dc91d87565bb191 ]
There are several places in the kernel where this kind of functionality is being used. Provide a generic helper for such cases.
Reviewed-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Link: https://lore.kernel.org/r/20220610120219.18988-1-andriy.shevchenko@linux.int... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Stable-dep-of: 27aabf27fd01 ("Bluetooth: fix use-after-free in device_for_each_child()") Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Guo Mengqi guomengqi3@huawei.com --- drivers/base/core.c | 20 ++++++++++++++++++++ include/linux/device.h | 2 ++ 2 files changed, 22 insertions(+)
diff --git a/drivers/base/core.c b/drivers/base/core.c index d3e6ce014ec2..be4eee572bff 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3427,6 +3427,26 @@ struct device *device_find_child_by_name(struct device *parent, } EXPORT_SYMBOL_GPL(device_find_child_by_name);
+static int match_any(struct device *dev, void *unused) +{ + return 1; +} + +/** + * device_find_any_child - device iterator for locating a child device, if any. + * @parent: parent struct device + * + * This is similar to the device_find_child() function above, but it + * returns a reference to a child device, if any. + * + * NOTE: you will need to drop the reference with put_device() after use. + */ +struct device *device_find_any_child(struct device *parent) +{ + return device_find_child(parent, NULL, match_any); +} +EXPORT_SYMBOL_GPL(device_find_any_child); + int __init devices_init(void) { devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); diff --git a/include/linux/device.h b/include/linux/device.h index 2f1de6f3d1c5..fc81fca76a12 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -831,6 +831,8 @@ struct device *device_find_child(struct device *dev, void *data, int (*match)(struct device *dev, void *data)); struct device *device_find_child_by_name(struct device *parent, const char *name); +struct device *device_find_any_child(struct device *parent); + int device_rename(struct device *dev, const char *new_name); int device_move(struct device *dev, struct device *new_parent, enum dpm_order dpm_order);