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Message-ID: <20180719015845.GA10768@embeddedor.com>
Date: Wed, 18 Jul 2018 20:58:45 -0500
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Jiancheng Xue <xuejiancheng@...ilicon.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>
Cc: linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
"Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] reset: hisilicon: fix potential NULL pointer dereference
There is a potential execution path in which function
platform_get_resource() returns NULL. If this happens,
we will end up having a NULL pointer dereference.
Fix this by adding asanity check in order to avoid a
NULL pointer dereference.
This code was detected with the help of Coccinelle.
Cc: stable@...r.kernel.org
Fixes: 97b7129cd2af ("reset: hisilicon: change the definition of hisi_reset_init")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
drivers/clk/hisilicon/reset.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/clk/hisilicon/reset.c b/drivers/clk/hisilicon/reset.c
index 2a5015c..5dfb48b 100644
--- a/drivers/clk/hisilicon/reset.c
+++ b/drivers/clk/hisilicon/reset.c
@@ -109,6 +109,9 @@ struct hisi_reset_controller *hisi_reset_init(struct platform_device *pdev)
return NULL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return NULL;
+
rstc->membase = devm_ioremap(&pdev->dev,
res->start, resource_size(res));
if (!rstc->membase)
--
2.7.4
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