linux-kernel - [PATCH] staging: android: ion: Zero CMA allocated memory

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Date:   Fri, 19 Jan 2018 11:16:47 -0800 (PST)
From:   Liam Mark <lmark@...eaurora.org>
To:     Laura Abbott <labbott@...hat.com>,
        Sumit Semwal <sumit.semwal@...aro.org>
cc:     linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org
Subject: [PATCH] staging: android: ion: Zero CMA allocated memory

Since the CMA API is now used directly the allocated memory is no longer
automatically zeroed.

Explicitly zero CMA allocated memory to ensure that no data is exposed
to userspace.

Change-Id: I08e143707a0d31610821a7f16826c262bf3c1999
Signed-off-by: Liam Mark <lmark@...eaurora.org>
---
 drivers/staging/android/ion/ion_cma_heap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/android/ion/ion_cma_heap.c b/drivers/staging/android/ion/ion_cma_heap.c
index 86196ff..91a9878 100644
--- a/drivers/staging/android/ion/ion_cma_heap.c
+++ b/drivers/staging/android/ion/ion_cma_heap.c
@@ -51,6 +51,8 @@ static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
 	if (!pages)
 		return -ENOMEM;
 
+	memset(page_address(pages), 0, size);
+
 	table = kmalloc(sizeof(*table), GFP_KERNEL);
 	if (!table)
 		goto err;
-- 
1.8.5.2


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