From: Brendan Shanks bshanks@codeweavers.com
[ Upstream commit 09264098ff153f60866039d60b31d39b66f55a31 ]
input_flush_device() should only be called once the struct file is being released and no open descriptors remain, but evdev_flush() was calling it whenever a file descriptor was closed.
This caused uploaded force-feedback effects to be erased when a process did a dup()/close() on the event FD, called system(), etc.
Call input_flush_device() from evdev_release() instead.
Reported-by: Mathieu Maret mathieu.maret@gmail.com Signed-off-by: Brendan Shanks bshanks@codeweavers.com Link: https://lore.kernel.org/r/20200421231003.7935-1-bshanks@codeweavers.com Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/input/evdev.c | 19 ++++--------------- 1 file changed, 4 insertions(+), 15 deletions(-)
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index e9ae3d500a55..700f018df668 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -342,20 +342,6 @@ static int evdev_fasync(int fd, struct file *file, int on) return fasync_helper(fd, file, on, &client->fasync); }
-static int evdev_flush(struct file *file, fl_owner_t id) -{ - struct evdev_client *client = file->private_data; - struct evdev *evdev = client->evdev; - - mutex_lock(&evdev->mutex); - - if (evdev->exist && !client->revoked) - input_flush_device(&evdev->handle, file); - - mutex_unlock(&evdev->mutex); - return 0; -} - static void evdev_free(struct device *dev) { struct evdev *evdev = container_of(dev, struct evdev, dev); @@ -469,6 +455,10 @@ static int evdev_release(struct inode *inode, struct file *file) unsigned int i;
mutex_lock(&evdev->mutex); + + if (evdev->exist && !client->revoked) + input_flush_device(&evdev->handle, file); + evdev_ungrab(evdev, client); mutex_unlock(&evdev->mutex);
@@ -1331,7 +1321,6 @@ static const struct file_operations evdev_fops = { .compat_ioctl = evdev_ioctl_compat, #endif .fasync = evdev_fasync, - .flush = evdev_flush, .llseek = no_llseek, };