tree 5423404840a8be072840dfb1a4b109757003fb12
parent 5015a300a522c8fb542dc993140e4c360cf4cf5f
author Anshuman Khandual <anshuman.khandual@arm.com> 1563319650 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1563330202 -0700

mm/ioremap: check virtual address alignment while creating huge mappings

Virtual address alignment is essential in ensuring correct clearing for
all intermediate level pgtable entries and freeing associated pgtable
pages.  An unaligned address can end up randomly freeing pgtable page
that potentially still contains valid mappings.  Hence also check it's
alignment along with existing phys_addr check.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Chintan Pandya <cpandya@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>