linux-kernel - [PATCH] extcon: axp288: Variable "val" could be uninitialized if regmap

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Date:   Mon,  2 Sep 2019 15:41:32 -0700
From:   Yizhuo <yzhai003@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     csong@...ucr.edu, zhiyunq@...ucr.edu, Yizhuo <yzhai003@....edu>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] extcon: axp288: Variable "val" could be uninitialized if regmap_read() fails

In function axp288_extcon_log_rsi(), variable "val" could be
uninitialized if regmap_read() fails. However, it's ued to
decide the control flow later in the if statement, which is
potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 drivers/extcon/extcon-axp288.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
index 7254852e6ec0..54116a926ab6 100644
--- a/drivers/extcon/extcon-axp288.c
+++ b/drivers/extcon/extcon-axp288.c
@@ -135,6 +135,11 @@ static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
 	int ret;
 
 	ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);
+	if (ret) {
+		dev_err(info->dev, "failed to read AXP288_PS_BOOT_REASON_REG\n");
+		return;
+	}
+
 	for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
 		if (val & BIT(i)) {
 			dev_dbg(info->dev, "%s\n", *rsi);
-- 
2.17.1