staging: sw_sync: Fix error paths

Check the return value of get_unused_fd to make sure a valid
file descriptor is returned.

Make sure to call put_unused_fd even if an error occurs before
the fd can be used.

Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <robclark@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: dri-devel@lists.freedesktop.org
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/android/sw_sync.c b/drivers/staging/android/sw_sync.c
index d689760..d768893 100644 (file)
--- a/drivers/staging/android/sw_sync.c
+++ b/drivers/staging/android/sw_sync.c
@@ -170,8 +170,13 @@ long sw_sync_ioctl_create_fence(struct sw_sync_timeline *obj, unsigned long arg)
        struct sync_fence *fence;
        struct sw_sync_create_fence_data data;
 
-       if (copy_from_user(&data, (void __user *)arg, sizeof(data)))
-               return -EFAULT;
+       if (fd < 0)
+               return fd;
+
+       if (copy_from_user(&data, (void __user *)arg, sizeof(data))) {
+               err = -EFAULT;
+               goto err;
+       }
 
        pt = sw_sync_pt_create(obj, data.value);
        if (pt == NULL) {