linux-kernel - [PATCH 1/1] Pinctrl: Add in zero check

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Date:   Tue, 16 Aug 2022 17:09:03 +0800
From:   Will Shiu <Will.Shiu@...iatek.com>
To:     <stanley.chu@...iatek.com>, <linus.walleij@...aro.org>,
        <matthias.bgg@...il.com>, <linux-gpio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <Will.Shiu@...iatek.com>
CC:     <wsd_upstream@...iatek.com>
Subject: [PATCH 1/1] Pinctrl: Add in zero check

add in check of buffer offset to avoid the exception when input 0 size.

Signed-off-by: Will Shiu <Will.Shiu@...iatek.com>
---
 drivers/pinctrl/pinmux.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index f94d43b082d9..646dff591b21 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -689,6 +689,9 @@ static ssize_t pinmux_select(struct file *file, const char __user *user_buf,
 	if (len > PINMUX_SELECT_MAX)
 		return -ENOMEM;
 
+	if (len <= 0)
+		return -EINVAL;
+
 	buf = kzalloc(PINMUX_SELECT_MAX, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
-- 
2.18.0