linux-kernel - [PATCH] drbd: Fix double free problem in drbd_create

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Message-ID: <1636013229-26309-1-git-send-email-wubo40@huawei.com>
Date:   Thu, 4 Nov 2021 16:07:09 +0800
From:   Wu Bo <wubo40@...wei.com>
To:     <lars.ellenberg@...bit.com>, <axboe@...nel.dk>
CC:     <mcgrof@...nel.org>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linfeilong@...wei.com>,
        <wubo40@...wei.com>
Subject: [PATCH] drbd: Fix double free problem in drbd_create_device

In drbd_create_device(), the 'out_no_io_page' lable has called 
blk_cleanup_disk() when return failed.

So remove the 'out_cleanup_disk' lable to avoid double free the
disk pointer.

Fixes: e92ab4eda516 ("drbd: add error handling support for add_disk()")
Signed-off-by: Wu Bo <wubo40@...wei.com>
---
 drivers/block/drbd/drbd_main.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 19db80a..53ba2dd 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2796,7 +2796,7 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
 
 	err = add_disk(disk);
 	if (err)
-		goto out_cleanup_disk;
+		goto out_idr_remove_vol;
 
 	/* inherit the connection state */
 	device->state.conn = first_connection(resource)->cstate;
@@ -2810,8 +2810,6 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig
 	drbd_debugfs_device_add(device);
 	return NO_ERROR;
 
-out_cleanup_disk:
-	blk_cleanup_disk(disk);
 out_idr_remove_vol:
 	idr_remove(&connection->peer_devices, vnr);
 out_idr_remove_from_resource:
-- 
1.8.3.1