[RFT PATCH 1/8] clk: ti: dra7-atl-clock: Fix possible ERR_PTR dereference

[Krzysztof Kozlowski]

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.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: 9ac33b0ce81f ("CLK: TI: Driver for DRA7 ATL (Audio Tracking Logic)")
---
 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 d86bc46b93bd..0a1df821860f 100644
--- a/drivers/clk/ti/clk-dra7-atl.c
+++ b/drivers/clk/ti/clk-dra7-atl.c
@@ -252,6 +252,11 @@ 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;
-- 
1.9.1

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