From: Michael Jones <michael.jones@xxxxxxxxxxxxxxxx>
commit c7f4ab26e3bcdaeb3e19ec658e3ad9092f1a6ceb allowed mapping
the NULL address if da_start==0, which would then not get unmapped.
Disallow this again. And spell variable 'alignment' correctly.
Signed-off-by: Michael Jones <michael.jones@xxxxxxxxxxxxxxxx>
---
arch/arm/plat-omap/iovmm.c | 16 ++++++++++------
1 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c
index 6dc1296..11c9b76 100644
--- a/arch/arm/plat-omap/iovmm.c
+++ b/arch/arm/plat-omap/iovmm.c
@@ -271,20 +271,24 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da,
size_t bytes, u32 flags)
{
struct iovm_struct *new, *tmp;
- u32 start, prev_end, alignement;
+ u32 start, prev_end, alignment;
if (!obj || !bytes)
return ERR_PTR(-EINVAL);
start = da;
- alignement = PAGE_SIZE;
+ alignment = PAGE_SIZE;
if (flags & IOVMF_DA_ANON) {
- start = obj->da_start;
+ /* Don't map address 0 */
+ if (obj->da_start)
+ start = obj->da_start;
+ else
+ start = obj->da_start + alignment;
if (flags & IOVMF_LINEAR)
- alignement = iopgsz_max(bytes);
- start = roundup(start, alignement);
+ alignment = iopgsz_max(bytes);
+ start = roundup(start, alignment);
} else if (start < obj->da_start || start > obj->da_end ||
obj->da_end - start < bytes) {
return ERR_PTR(-EINVAL);
@@ -304,7 +308,7 @@ static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da,
goto found;
if (tmp->da_end >= start && flags & IOVMF_DA_ANON)
- start = roundup(tmp->da_end + 1, alignement);
+ start = roundup(tmp->da_end + 1, alignment);
prev_end = tmp->da_end;
}
--
1.7.0.4
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