ARM: 7768/1: prevent risks of out-of-bound access in ASID allocator

On a CPU that never ran anything, both the active and reserved ASID
fields are set to zero. In this case the ASID_TO_IDX() macro will
return -1, which is not a very useful value to index a bitmap.

Instead of trying to offset the ASID so that ASID #1 is actually
bit 0 in the asid_map bitmap, just always ignore bit 0 and start
the search from bit 1. This makes the code a bit more readable,
and without risk of OoB access.

Cc: <[email protected]> # 3.9
Acked-by: Will Deacon <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Reported-by: Catalin Marinas <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Russell King <[email protected]>

0 files changed, 0 insertions, 0 deletions