kexec: Fix off-by-one errors in locate_hole()

When calling locate_hole() with "hole_size" equal to the size of an
available memory block, it fails to use that memory block.

"end" and "hole_max" point to the last byte within the range, hence
  - "size = end - start" is one less than "hole_size",
  - "hole_base + hole_size" is one more than "hole_max".

Subtract one from "hole_size" when doing the comparison (adding 1 to "size"
could overflow in case of one big range covering the whole address space).
But explicitly check if "hole_size" is zero first, to handle this case
without causing underflows.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Simon Horman <horms@verge.net.au>

0 files changed, 0 insertions, 0 deletions