linux-kernel - [PATCH] clk: qcom: Allocate space for NULL terimation in DFS table

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Date:   Thu, 30 Aug 2018 10:34:37 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Stephen Boyd <sboyd@...nel.org>, Taniya Das <tdas@...eaurora.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-soc@...r.kernel.org, linux-clk@...r.kernel.org
Subject: [PATCH] clk: qcom: Allocate space for NULL terimation in DFS table

The table allocated in clk_rcg2_dfs_populate_freq_table() is
eventually iterated over by qcom_find_freq() which assumes that the
table is NULL terminated.  Allocate one extra space in the array for
the NULL termination.  Initting of the NULL termination is implicit
due to kcalloc().

Fixes: cc4f6944d0e3 ("clk: qcom: Add support for RCG to register for DFS")
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

 drivers/clk/qcom/clk-rcg2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
index d5d77f9ad170..6e3bd195d012 100644
--- a/drivers/clk/qcom/clk-rcg2.c
+++ b/drivers/clk/qcom/clk-rcg2.c
@@ -993,7 +993,8 @@ static int clk_rcg2_dfs_populate_freq_table(struct clk_rcg2 *rcg)
 	struct freq_tbl *freq_tbl;
 	int i;
 
-	freq_tbl = kcalloc(MAX_PERF_LEVEL, sizeof(*freq_tbl), GFP_KERNEL);
+	/* Allocate space for 1 extra since table is NULL terminated */
+	freq_tbl = kcalloc(MAX_PERF_LEVEL + 1, sizeof(*freq_tbl), GFP_KERNEL);
 	if (!freq_tbl)
 		return -ENOMEM;
 	rcg->freq_tbl = freq_tbl;
-- 
2.19.0.rc0.228.g281dcd1b4d0-goog