[PATCH] Input: Added check for grabbed device

[Anshul Garg <aksgarg1989@gmail.com>]

From: Anshul Garg <aksgarg1989@gmail.com>

If input device is grabbed then client which has grabbed the device can
flush or write to the device so for other clients -EINVAL should be returned.

Signed-off-by: Anshul Garg <anshul.g@samsung.com>
---
 drivers/input/evdev.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index b1a52ab..105e489 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -277,6 +277,8 @@ static int evdev_flush(struct file *file, fl_owner_t id)
 
 	if (!evdev->exist || client->revoked)
 		retval = -ENODEV;
+	else if (evdev->grab && evdev->grab != client)
+		retval = -EINVAL;
 	else
 		retval = input_flush_device(&evdev->handle, file);
 
@@ -475,6 +477,11 @@ static ssize_t evdev_write(struct file *file, const char __user *buffer,
 		goto out;
 	}
 
+
+	if (evdev->grab && evdev->grab != client) {
+		retval = -EINVAL;
+		goto out;
+	}
 	while (retval + input_event_size() <= count) {
 
 		if (input_event_from_user(buffer + retval, &event)) {
-- 
1.7.9.5


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