linux-kernel - [PATCH 4.9 01/32] Revert "loop: Fix double mutex_unlock(&loop_ctl_mutex) in loop_control

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Message-Id: <20190304081602.415115861@linuxfoundation.org>
Date:   Mon,  4 Mar 2019 09:21:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Thomas Lindroth <thomas.lindroth@...il.com>,
        Jan Kara <jack@...e.cz>,
        syzbot <syzbot+c0138741c2290fc5e63f@...kaller.appspotmail.com>,
        Ming Lei <ming.lei@...hat.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 4.9 01/32] Revert "loop: Fix double mutex_unlock(&loop_ctl_mutex) in loop_control_ioctl()"

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This reverts commit 5d3cf50105d007adc54949e0caeca1e944549723 which is
commit 628bd85947091830a8c4872adfd5ed1d515a9cf2 upstream.

It does not work properly in the 4.9.y tree and causes more problems
than it fixes, so revert it.

Reported-by: Thomas Lindroth <thomas.lindroth@...il.com>
Reported-by: Jan Kara <jack@...e.cz>
Cc: syzbot <syzbot+c0138741c2290fc5e63f@...kaller.appspotmail.com>
Cc: Ming Lei <ming.lei@...hat.com>
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/block/loop.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1929,10 +1929,12 @@ 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;