From: Anshul Garg <[email protected]> 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 <[email protected]> --- 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 --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
