>From 4b9e5556fada37dff1eff13665a229b69e1f7dd8 Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 10 Nov 2018 17:04:40 +0900
Subject: [PATCH] loop: Fix double mutex_unlock(&loop_ctl_mutex) in loop_control_ioctl().
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.
Reported-by: syzbot <syzbot+c0138741c2290fc5e63f@xxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
---
drivers/block/loop.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index bf6bc35..176ab1f 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -2074,12 +2074,10 @@ static long loop_control_ioctl(struct file *file, unsigned int cmd,
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;
--
1.8.3.1
