linux-kernel - [PATCH] pinctrl:sunplus: Add check for kmalloc

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Date:   Tue, 23 May 2023 18:11:28 +0800
From:   Wells Lu <wellslutw@...il.com>
To:     linus.walleij@...aro.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     wells.lu@...plus.com, Wells Lu <wellslutw@...il.com>
Subject: [PATCH] pinctrl:sunplus: Add check for kmalloc

Fix Smatch static checker warning:
potential null dereference 'configs'. (kmalloc returns null)

Fixes: aa74c44be19c ("pinctrl: Add driver for Sunplus SP7021")
Signed-off-by: Wells Lu <wellslutw@...il.com>
---
 drivers/pinctrl/sunplus/sppctl.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/pinctrl/sunplus/sppctl.c b/drivers/pinctrl/sunplus/sppctl.c
index 6bbbab3a6..f2dcc68ee 100644
--- a/drivers/pinctrl/sunplus/sppctl.c
+++ b/drivers/pinctrl/sunplus/sppctl.c
@@ -883,6 +883,8 @@ static int sppctl_dt_node_to_map(struct pinctrl_dev *pctldev, struct device_node
 			(*map)[i].data.configs.num_configs = 1;
 			(*map)[i].data.configs.group_or_pin = pin_get_name(pctldev, pin_num);
 			configs = kmalloc(sizeof(*configs), GFP_KERNEL);
+			if (!configs)
+				return -ENOMEM;
 			*configs = FIELD_GET(GENMASK(7, 0), dt_pin);
 			(*map)[i].data.configs.configs = configs;
 
@@ -896,6 +898,8 @@ static int sppctl_dt_node_to_map(struct pinctrl_dev *pctldev, struct device_node
 			(*map)[i].data.configs.num_configs = 1;
 			(*map)[i].data.configs.group_or_pin = pin_get_name(pctldev, pin_num);
 			configs = kmalloc(sizeof(*configs), GFP_KERNEL);
+			if (!configs)
+				return -ENOMEM;
 			*configs = SPPCTL_IOP_CONFIGS;
 			(*map)[i].data.configs.configs = configs;
 
-- 
2.25.1