linux-kernel - [PATCH 5.7 105/477] scsi: sr: Fix sr_probe() missing deallocate of device minor

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Message-Id: <20200623195412.556728769@linuxfoundation.org>
Date:   Tue, 23 Jun 2020 21:51:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Simon Arlott <simon@...iron.net>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 105/477] scsi: sr: Fix sr_probe() missing deallocate of device minor

From: Simon Arlott <simon@...iron.net>

[ Upstream commit 6555781b3fdec5e94e6914511496144241df7dee ]

If the cdrom fails to be registered then the device minor should be
deallocated.

Link: https://lore.kernel.org/r/072dac4b-8402-4de8-36bd-47e7588969cd@0882a8b5-c6c3-11e9-b005-00805fc181fe
Signed-off-by: Simon Arlott <simon@...iron.net>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/sr.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 8d062d4f3ce0b..1e13c6a0f0caf 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -797,7 +797,7 @@ static int sr_probe(struct device *dev)
 	cd->cdi.disk = disk;
 
 	if (register_cdrom(&cd->cdi))
-		goto fail_put;
+		goto fail_minor;
 
 	/*
 	 * Initialize block layer runtime PM stuffs before the
@@ -815,6 +815,10 @@ static int sr_probe(struct device *dev)
 
 	return 0;
 
+fail_minor:
+	spin_lock(&sr_index_lock);
+	clear_bit(minor, sr_index_bits);
+	spin_unlock(&sr_index_lock);
 fail_put:
 	put_disk(disk);
 	mutex_destroy(&cd->lock);
-- 
2.25.1