linux-kernel - [PATCH v2 6/8] rockchip/rga: use 64-bit arithmetic instead of 32-bit

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Message-ID: <94fd0993cde02e18ee5d7f54707f8ce0d0341a0c.1517856716.git.gustavo@embeddedor.com>
Date:   Mon, 5 Feb 2018 14:27:37 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Jacob chen <jacob2.chen@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH v2 6/8] rockchip/rga: use 64-bit arithmetic instead of 32-bit

Cast p to dma_addr_t in order to avoid a potential integer overflow.
This variable is being used in a context that expects an expression
of type dma_addr_t (u64).

The expression p << PAGE_SHIFT is currently being evaluated
using 32-bit arithmetic.

Addresses-Coverity-ID: 1458347
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
Changes in v2:
 - Update subject and changelog to better reflect the proposed code change.

 drivers/media/platform/rockchip/rga/rga-buf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/rockchip/rga/rga-buf.c b/drivers/media/platform/rockchip/rga/rga-buf.c
index 49cacc7..a43b57a 100644
--- a/drivers/media/platform/rockchip/rga/rga-buf.c
+++ b/drivers/media/platform/rockchip/rga/rga-buf.c
@@ -140,7 +140,8 @@ void rga_buf_map(struct vb2_buffer *vb)
 		address = sg_phys(sgl);
 
 		for (p = 0; p < len; p++) {
-			dma_addr_t phys = address + (p << PAGE_SHIFT);
+			dma_addr_t phys = address +
+					  ((dma_addr_t)p << PAGE_SHIFT);
 
 			pages[mapped_size + p] = phys;
 		}
-- 
2.7.4