linux-kernel - [PATCH] media: rga: fix NULL pointer dereferences

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Date:   Sat,  9 Mar 2019 00:35:56 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Jacob chen <jacob2.chen@...k-chips.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: rga: fix NULL pointer dereferences

In case __get_free_pages fails, return -ENOMEM to avoid NULL
pointer dereferences.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/media/platform/rockchip/rga/rga.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/platform/rockchip/rga/rga.c b/drivers/media/platform/rockchip/rga/rga.c
index 5c653287185f..d42b214977a9 100644
--- a/drivers/media/platform/rockchip/rga/rga.c
+++ b/drivers/media/platform/rockchip/rga/rga.c
@@ -892,8 +892,13 @@ static int rga_probe(struct platform_device *pdev)
 
 	rga->src_mmu_pages =
 		(unsigned int *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 3);
+	if (!rga->src_mmu_pages)
+		return -ENOMEM;
+
 	rga->dst_mmu_pages =
 		(unsigned int *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 3);
+	if (!rga->dst_mmu_pages)
+		return -ENOMEM;
 
 	def_frame.stride = (def_frame.width * def_frame.fmt->depth) >> 3;
 	def_frame.size = def_frame.stride * def_frame.height;
-- 
2.17.1