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fuse_dev_ioctl() performed fuse_get_dev() on a user-supplied fd, leading to a type confusion issue. Fix it by checking file->f_op. Signed-off-by: Jann Horn <jann@thejh.net> Acked-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>