linux-kernel - [PATCH 3.16.y-ckt 150/185] clk: ti: dra7-atl-clock: Fix possible ERR

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Message-Id: <1436951580-15977-151-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 15 Jul 2015 10:12:25 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 150/185] clk: ti: dra7-atl-clock: Fix possible ERR_PTR dereference

3.16.7-ckt15 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Krzysztof Kozlowski <k.kozlowski@...sung.com>

commit e0cdcda508f110b7ec190dc7c5eb2869ba73a535 upstream.

of_clk_get_from_provider() returns ERR_PTR on failure. The
dra7-atl-clock driver was not checking its return value and
immediately used it in __clk_get_hw().  __clk_get_hw()
dereferences supplied clock, if it is not NULL, so in that case
it would dereference an ERR_PTR.

Fixes: 9ac33b0ce81f ("CLK: TI: Driver for DRA7 ATL (Audio Tracking Logic)")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/clk/ti/clk-dra7-atl.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/clk/ti/clk-dra7-atl.c b/drivers/clk/ti/clk-dra7-atl.c
index af29359677da..d1db76887b8b 100644
--- a/drivers/clk/ti/clk-dra7-atl.c
+++ b/drivers/clk/ti/clk-dra7-atl.c
@@ -250,6 +250,11 @@ static int of_dra7_atl_clk_probe(struct platform_device *pdev)
 		}
 
 		clk = of_clk_get_from_provider(&clkspec);
+		if (IS_ERR(clk)) {
+			pr_err("%s: failed to get atl clock %d from provider\n",
+			       __func__, i);
+			return PTR_ERR(clk);
+		}
 
 		cdesc = to_atl_desc(__clk_get_hw(clk));
 		cdesc->cinfo = cinfo;
--
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