[PATCH 0/3] of: reserved_mem: fix a few reserved memory issues

From: Wandun Chen <[email protected]>

This series fixes a few issues in the reserved-memory handling:

1. A region whose early reservation failed was still counted and
   initialized by the late scan, handing unprotected memory to a
   device. (patch 1)

2. A statically placed region overlapping an existing reservation was
   accepted, so the overlap could be used by two regions concurrently
   and freed on init failure. (patch 2)

3. A dynamically allocated no-map region was never returned to the
   buddy allocator when its driver init failed: only
   memblock_clear_nomap() was called, leaving the entry in
   memblock.reserved. (patch 3)

Sashiko reported the original issue in [1].

This is sent for review now; given the v7.2 release is closing, there
is no expectation to merge it this cycle.

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

Wandun Chen (3):
  of: reserved_mem: skip init for regions whose early reservation failed
  of: reserved_mem: reject statically placed regions overlapping
    existing reservations
  of: reserved_mem: release dynamically allocated no-map region on init
    failure

 drivers/of/of_reserved_mem.c | 69 ++++++++++++++++++++++++++++--------
 1 file changed, 55 insertions(+), 14 deletions(-)

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2.43.0