driver core: parent lock fixes

Mario Peter reported that USB interfaces may be probed without holding the parent USB device lock during asynchronous and deferred probe.

This series addresses both cases, while fixing a long-standing use-after-free issue with the parent lock implementation stemming from the fact that the driver core does not necessarily hold a reference to the parent device when taking its lock.

Johan

Changes in v2:
- fix the parent lock UAF issue (new patch)
- include my update of Mario's fix as it also depends on the UAF fix [1]

[1] https://lore.kernel.org/all/[email protected]/

Johan Hovold (2):
driver core: fix parent lock use-after-free on USB disconnect driver core: take parent lock on deferred probe

Mario Peter (1):
driver core: take parent lock in async device attach

 drivers/base/base.h        |  1 +
 drivers/base/bus.c         | 32 +++++++++----
 drivers/base/dd.c          | 92 +++++++++++++++++++++-----------------
 drivers/usb/core/driver.c  |  1 -
 drivers/usb/core/message.c |  1 +
 include/linux/device.h     |  5 +++
 include/linux/device/bus.h |  3 --
 7 files changed, 81 insertions(+), 54 deletions(-)

2.55.0