omap iommu: Reject unaligned addresses at setting page table entry

This rejects unaligned device virtual address('da') and physical
address('pa') and informs error to caller when a page table entry is
set. Otherwise, a wrong address can be used by IO device.

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Cc: Hari Kanigeri <h-kanigeri2@ti.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c
index 9598d40e276..bc094dbacee 100644
--- a/arch/arm/plat-omap/iommu.c
+++ b/arch/arm/plat-omap/iommu.c
@@ -516,6 +516,12 @@ static int iopgd_alloc_section(struct iommu *obj, u32 da, u32 pa, u32 prot)
 {
         u32 *iopgd = iopgd_offset(obj, da);
 
+        if ((da | pa) & ~IOSECTION_MASK) {
+                dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
+                        __func__, da, pa, IOSECTION_SIZE);
+                return -EINVAL;
+        }
+
         *iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION;
         flush_iopgd_range(iopgd, iopgd);
         return 0;
@@ -526,6 +532,12 @@ static int iopgd_alloc_super(struct iommu *obj, u32 da, u32 pa, u32 prot)
         u32 *iopgd = iopgd_offset(obj, da);
         int i;
 
+        if ((da | pa) & ~IOSUPER_MASK) {
+                dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
+                        __func__, da, pa, IOSUPER_SIZE);
+                return -EINVAL;
+        }
+
         for (i = 0; i < 16; i++)
                 *(iopgd + i) = (pa & IOSUPER_MASK) | prot | IOPGD_SUPER;
         flush_iopgd_range(iopgd, iopgd + 15);
@@ -555,6 +567,12 @@ static int iopte_alloc_large(struct iommu *obj, u32 da, u32 pa, u32 prot)
         u32 *iopte = iopte_alloc(obj, iopgd, da);
         int i;
 
+        if ((da | pa) & ~IOLARGE_MASK) {
+                dev_err(obj->dev, "%s: %08x:%08x should aligned on %08lx\n",
+                        __func__, da, pa, IOLARGE_SIZE);
+                return -EINVAL;
+        }
+
         if (IS_ERR(iopte))
                 return PTR_ERR(iopte);