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Message-Id: <20191104212101.712737282@linuxfoundation.org>
Date: Mon, 4 Nov 2019 22:44:38 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Adam Ford <aford173@...il.com>,
Yegor Yefremov <yegorslists@...glemail.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 40/95] serial: mctrl_gpio: Check for NULL pointer
From: Adam Ford <aford173@...il.com>
[ Upstream commit 37e3ab00e4734acc15d96b2926aab55c894f4d9c ]
When using mctrl_gpio_to_gpiod, it dereferences gpios into a single
requested GPIO. This dereferencing can break if gpios is NULL,
so this patch adds a NULL check before dereferencing it. If
gpios is NULL, this function will also return NULL.
Signed-off-by: Adam Ford <aford173@...il.com>
Reviewed-by: Yegor Yefremov <yegorslists@...glemail.com>
Link: https://lore.kernel.org/r/20191006163314.23191-1-aford173@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/tty/serial/serial_mctrl_gpio.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index 42e42e3e7a6e6..388f710468490 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -69,6 +69,9 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set);
struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios,
enum mctrl_gpio_idx gidx)
{
+ if (gpios == NULL)
+ return NULL;
+
return gpios->gpio[gidx];
}
EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod);
--
2.20.1
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