From: Anshul Garg <aksgarg1989@xxxxxxxxx>
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@xxxxxxxxxxx>
---
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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