| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.1 240/267] clk: ti: dra7-atl-clock: Fix possible ERR_PTR dereference | Date | Fri, 31 Jul 2015 12:41:31 -0700 |
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4.1-stable review patch. If anyone has any objections, please let me know.
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From: Krzysztof Kozlowski <k.kozlowski@samsung.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@samsung.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/clk/ti/clk-dra7-atl.c | 5 +++++ 1 file changed, 5 insertions(+)
--- 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 } 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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