[PATCH 089/115] ion: check invalid values in ion_system_heap

John Stultz
2013-12-13T22:28:31Z

From: Colin Cross <ccross@android.com>

ion_system_heap can only satisfy page alignment, and
ion_system_contig_heap can only satisify alignment to the
allocation size. Neither can support faulting user mappings
because they use slab pages.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
drivers/staging/android/ion/ion_system_heap.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index 967eedc..62a07ec 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -150,6 +150,12 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
long size_remaining = PAGE_ALIGN(size);
unsigned int max_order = orders[0];

+ if (align > PAGE_SIZE)
+ return -EINVAL;
+
+ if (ion_buffer_fault_user_mappings(buffer))
+ return -EINVAL;
+
INIT_LIST_HEAD(&pages);
while (size_remaining > 0) {
info = alloc_largest_available(sys_heap, buffer, size_remaining, max_order);
@@ -362,6 +368,14 @@ static int ion_system_contig_heap_allocate(struct ion_heap *heap,
unsigned long align,
unsigned long flags)
{
+ int order = get_order(len);
+
+ if (align > (PAGE_SIZE << order))
+ return -EINVAL;
+
+ if (ion_buffer_fault_user_mappings(buffer))
+ return -EINVAL;
+
buffer->priv_virt = kzalloc(len, GFP_KERNEL);
if (!buffer->priv_virt)
return -ENOMEM;
--
1.8.3.2