powerpc/mm: Validate address values against different region limits

This adds an explicit check in various functions.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 4d9fa9e900d5..e6d5065b0bc8 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -339,6 +339,12 @@ void __init radix_init_pgtable(void)
 		 * page tables will be allocated within the range. No
 		 * need or a node (which we don't have yet).
 		 */
+
+		if ((reg->base + reg->size) >= RADIX_VMALLOC_START) {
+			pr_warn("Outisde the supported range\n");
+			continue;
+		}
+
 		WARN_ON(create_physical_mapping(reg->base,
 						reg->base + reg->size,
 						-1));
@@ -895,6 +901,11 @@ static void __meminit remove_pagetable(unsigned long start, unsigned long end)
 
 int __meminit radix__create_section_mapping(unsigned long start, unsigned long end, int nid)
 {
+	if (end >= RADIX_VMALLOC_START) {
+		pr_warn("Outisde the supported range\n");
+		return -1;
+	}
+
 	return create_physical_mapping(start, end, nid);
 }
 
@@ -922,6 +933,11 @@ int __meminit radix__vmemmap_create_mapping(unsigned long start,
 	int nid = early_pfn_to_nid(phys >> PAGE_SHIFT);
 	int ret;
 
+	if ((start + page_size) >= RADIX_VMEMMAP_END) {
+		pr_warn("Outisde the supported range\n");
+		return -1;
+	}
+
 	ret = __map_kernel_page_nid(start, phys, __pgprot(flags), page_size, nid);
 	BUG_ON(ret);