linux-kernel - [PATCH 089/115] ion: check invalid values in ion_system

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Date:	Fri, 13 Dec 2013 14:25:03 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Jesse Barker <jesse.barker@....com>,
	Colin Cross <ccross@...roid.com>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 089/115] ion: check invalid values in ion_system_heap

From: Colin Cross <ccross@...roid.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@...roid.com>
Signed-off-by: John Stultz <john.stultz@...aro.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

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