linux-kernel - [PATCH 4.9 44/61] clk: mvebu: Off by one bugs in cp110_of_clk

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Date:   Thu, 20 Dec 2018 10:18:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 44/61] clk: mvebu: Off by one bugs in cp110_of_clk_get()

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

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

[ Upstream commit d9f5b7f5dd0fa74a89de5a7ac1e26366f211ccee ]

These > comparisons should be >= to prevent reading beyond the end of
of the clk_data->hws[] buffer.

The clk_data->hws[] array is allocated in cp110_syscon_common_probe()
when we do:
	cp110_clk_data = devm_kzalloc(dev, sizeof(*cp110_clk_data) +
				      sizeof(struct clk_hw *) * CP110_CLK_NUM,
				      GFP_KERNEL);
As you can see, it has CP110_CLK_NUM elements which is equivalent to
CP110_MAX_CORE_CLOCKS + CP110_MAX_GATABLE_CLOCKS.

Fixes: d3da3eaef7f4 ("clk: mvebu: new driver for Armada CP110 system controller")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/mvebu/cp110-system-controller.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/mvebu/cp110-system-controller.c b/drivers/clk/mvebu/cp110-system-controller.c
index f2303da7fda7..465953c75320 100644
--- a/drivers/clk/mvebu/cp110-system-controller.c
+++ b/drivers/clk/mvebu/cp110-system-controller.c
@@ -172,11 +172,11 @@ static struct clk *cp110_of_clk_get(struct of_phandle_args *clkspec, void *data)
 	unsigned int idx = clkspec->args[1];
 
 	if (type == CP110_CLK_TYPE_CORE) {
-		if (idx > CP110_MAX_CORE_CLOCKS)
+		if (idx >= CP110_MAX_CORE_CLOCKS)
 			return ERR_PTR(-EINVAL);
 		return clk_data->clks[idx];
 	} else if (type == CP110_CLK_TYPE_GATABLE) {
-		if (idx > CP110_MAX_GATABLE_CLOCKS)
+		if (idx >= CP110_MAX_GATABLE_CLOCKS)
 			return ERR_PTR(-EINVAL);
 		return clk_data->clks[CP110_MAX_CORE_CLOCKS + idx];
 	}
-- 
2.19.1