linux-kernel - [PATCH v2 2/6] Input - soc_button_array: bail out earlier if gpiod

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 13 May 2016 18:05:50 +0200
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Bastien Nocera <hadess@...ess.net>,
	Lejun Zhu <lejun.zhu@...ux.intel.com>,
	Fabio Estevam <festevam@...il.com>
Subject: [PATCH v2 2/6] Input - soc_button_array: bail out earlier if gpiod_count is null

The PNP0C40 device of the Surface 3 doesn't have any GPIO attached to it.
Instead of trying to access the GPIO, request the count beforehand and
bail out if it is null or if an error is returned.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---
changes in v2:
- hunk moved down for better integration with later patches

 drivers/input/misc/soc_button_array.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
index bbd433c..5467d04 100644
--- a/drivers/input/misc/soc_button_array.c
+++ b/drivers/input/misc/soc_button_array.c
@@ -167,6 +167,11 @@ static int soc_button_probe(struct platform_device *pdev)
 
 	button_info = (struct soc_button_info *)id->driver_data;
 
+	if (gpiod_count(&pdev->dev, KBUILD_MODNAME) <= 0) {
+		dev_info(&pdev->dev, "no GPIO attached, ignoring...\n");
+		return -ENODEV;
+	}
+
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
-- 
2.5.0