[PATCH] fuse: verify zero padding in fuse_backing_map

[Amir Goldstein <amir73il@xxxxxxxxx>]

To allow us extending the interface in the future.

Fixes: 44350256ab94 ("fuse: implement ioctls to manage backing files")
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
 fs/fuse/passthrough.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/passthrough.c b/fs/fuse/passthrough.c
index 1567f0323858..9666d13884ce 100644
--- a/fs/fuse/passthrough.c
+++ b/fs/fuse/passthrough.c
@@ -225,7 +225,7 @@ int fuse_backing_open(struct fuse_conn *fc, struct fuse_backing_map *map)
 		goto out;
 
 	res = -EINVAL;
-	if (map->flags)
+	if (map->flags || map->padding)
 		goto out;
 
 	file = fget(map->fd);
-- 
2.34.1