linux-kernel - [PATCH] clk: microchip: check for null return of devm

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Message-ID: <20221119054858.178629-1-tanghui20@huawei.com>
Date:   Sat, 19 Nov 2022 13:48:58 +0800
From:   Hui Tang <tanghui20@...wei.com>
To:     <mturquette@...libre.com>, <sboyd@...nel.org>
CC:     <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yusongping@...wei.com>, <claudiu.beznea@...rochip.com>,
        <conor.dooley@...rochip.com>
Subject: [PATCH] clk: microchip: check for null return of devm_kzalloc()

Because of the possilble failure of devm_kzalloc(), name might be NULL and
will cause null pointer derefrence later.

Therefore, it might be better to check it and directly return -ENOMEM.

Fixes: d39fb172760e ("clk: microchip: add PolarFire SoC fabric clock support")
Signed-off-by: Hui Tang <tanghui20@...wei.com>
---
 drivers/clk/microchip/clk-mpfs-ccc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/clk/microchip/clk-mpfs-ccc.c b/drivers/clk/microchip/clk-mpfs-ccc.c
index 7be028dced63..32aae880a14f 100644
--- a/drivers/clk/microchip/clk-mpfs-ccc.c
+++ b/drivers/clk/microchip/clk-mpfs-ccc.c
@@ -166,6 +166,9 @@ static int mpfs_ccc_register_outputs(struct device *dev, struct mpfs_ccc_out_hw_
 		struct mpfs_ccc_out_hw_clock *out_hw = &out_hws[i];
 		char *name = devm_kzalloc(dev, 23, GFP_KERNEL);
 
+		if (!name)
+			return -ENOMEM;
+
 		snprintf(name, 23, "%s_out%u", parent->name, i);
 		out_hw->divider.hw.init = CLK_HW_INIT_HW(name, &parent->hw, &clk_divider_ops, 0);
 		out_hw->divider.reg = data->pll_base[i / MPFS_CCC_OUTPUTS_PER_PLL] +
@@ -200,6 +203,9 @@ static int mpfs_ccc_register_plls(struct device *dev, struct mpfs_ccc_pll_hw_clo
 		struct mpfs_ccc_pll_hw_clock *pll_hw = &pll_hws[i];
 		char *name = devm_kzalloc(dev, 18, GFP_KERNEL);
 
+		if (!name)
+			return -ENOMEM;
+
 		pll_hw->base = data->pll_base[i];
 		snprintf(name, 18, "ccc%s_pll%u", strchrnul(dev->of_node->full_name, '@'), i);
 		pll_hw->name = (const char *)name;
-- 
2.17.1