linux-kernel - [PATCH] scsi: sd: cleanup gendisk if device_add

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Date:   Thu, 31 Mar 2022 21:10:19 -0400
From:   Wenchao Hao <haowenchao@...wei.com>
To:     "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <linfeilong@...wei.com>, Wenchao Hao <haowenchao@...wei.com>,
        <syzbot+f08c77040fa163a75a46@...kaller.appspotmail.com>
Subject: [PATCH] scsi: sd: cleanup gendisk if device_add_disk() failed

We forget to call blk_cleanup_disk() when device_add_disk() failed.
Which would cause memory leak of gendisk and sched_tags alloced in
elevator_init_mq()

Reference:https://syzkaller.appspot.com/x/log.txt?x=13b41dcb700000
Reported-and-tested-by: syzbot+f08c77040fa163a75a46@...kaller.appspotmail.com

Signed-off-by: Wenchao Hao <haowenchao@...wei.com>
---
 drivers/scsi/sd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a390679cf458..4620a1158272 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3475,6 +3475,7 @@ static int sd_probe(struct device *dev)
 	error = device_add_disk(dev, gd, NULL);
 	if (error) {
 		put_device(&sdkp->disk_dev);
+		blk_cleanup_disk(gd);
 		goto out;
 	}
 
-- 
2.32.0