4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Tetsuo Handa <[email protected]> commit 628bd85947091830a8c4872adfd5ed1d515a9cf2 upstream. Commit 0a42e99b58a20883 ("loop: Get rid of loop_index_mutex") forgot to remove mutex_unlock(&loop_ctl_mutex) from loop_control_ioctl() when replacing loop_index_mutex with loop_ctl_mutex. Fixes: 0a42e99b58a20883 ("loop: Get rid of loop_index_mutex") Reported-by: syzbot <[email protected]> Reviewed-by: Ming Lei <[email protected]> Reviewed-by: Jan Kara <[email protected]> Signed-off-by: Tetsuo Handa <[email protected]> Signed-off-by: Jens Axboe <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/block/loop.c | 2 -- 1 file changed, 2 deletions(-) --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1936,12 +1936,10 @@ static long loop_control_ioctl(struct fi break; if (lo->lo_state != Lo_unbound) { ret = -EBUSY; - mutex_unlock(&loop_ctl_mutex); break; } if (atomic_read(&lo->lo_refcnt) > 0) { ret = -EBUSY; - mutex_unlock(&loop_ctl_mutex); break; } lo->lo_disk->private_data = NULL;
