linux-kernel - [PATCH] keyboard: (samsung) fix a missing check of return value

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Message-Id: <20181226015131.71198-1-kjlu@umn.edu>
Date:   Tue, 25 Dec 2018 19:51:29 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Kees Cook <keescook@...omium.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] keyboard: (samsung) fix a missing check of return value

of_device_is_compatible() returns false if the device is incompatible.
The fix adds a check for its return value;

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/input/keyboard/samsung-keypad.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/input/keyboard/samsung-keypad.c b/drivers/input/keyboard/samsung-keypad.c
index 1fe1aa2adf85..5ba940f3f76e 100644
--- a/drivers/input/keyboard/samsung-keypad.c
+++ b/drivers/input/keyboard/samsung-keypad.c
@@ -387,9 +387,13 @@ static int samsung_keypad_probe(struct platform_device *pdev)
 	keypad->stopped = true;
 	init_waitqueue_head(&keypad->wait);
 
-	if (pdev->dev.of_node)
-		keypad->type = of_device_is_compatible(pdev->dev.of_node,
-					"samsung,s5pv210-keypad");
+	if (pdev->dev.of_node) {
+		error = of_device_is_compatible(pdev->dev.of_node,
+				"samsung,s5pv210-keypad");
+		if (!error)
+			return -EINVAL;
+		keypad->type = error;
+	}
 	else
 		keypad->type = platform_get_device_id(pdev)->driver_data;
 
-- 
2.17.2 (Apple Git-113)