From e09093927e54323018dbb3bf6189c85a7f176bae Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Wed, 17 Apr 2019 18:29:15 +0530 Subject: powerpc/mm: Validate address values against different region limits This adds an explicit check in various functions. Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman --- arch/powerpc/mm/pgtable_64.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'arch/powerpc/mm/pgtable_64.c') diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 56068cac2a3c..72f58c076e26 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -121,6 +121,11 @@ void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, pgprot_ if (pgprot_val(prot) & H_PAGE_4K_PFN) return NULL; + if ((ea + size) >= (void *)IOREMAP_END) { + pr_warn("Outisde the supported range\n"); + return NULL; + } + WARN_ON(pa & ~PAGE_MASK); WARN_ON(((unsigned long)ea) & ~PAGE_MASK); WARN_ON(size & ~PAGE_MASK); -- cgit v1.2.3