From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:59024 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423144AbeBOPhe (ORCPT ); Thu, 15 Feb 2018 10:37:34 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bart Van Assche , Tejun Heo , "Maciej S. Szmigiero" , Jens Axboe Subject: [PATCH 4.14 176/195] pktcdvd: Fix pkt_setup_dev() error path Date: Thu, 15 Feb 2018 16:17:47 +0100 Message-Id: <20180215151714.883009487@linuxfoundation.org> In-Reply-To: <20180215151705.738773577@linuxfoundation.org> References: <20180215151705.738773577@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bart Van Assche commit 5a0ec388ef0f6e33841aeb810d7fa23f049ec4cd upstream. Commit 523e1d399ce0 ("block: make gendisk hold a reference to its queue") modified add_disk() and disk_release() but did not update any of the error paths that trigger a put_disk() call after disk->queue has been assigned. That introduced the following behavior in the pktcdvd driver if pkt_new_dev() fails: Kernel BUG at 00000000e98fd882 [verbose debug info unavailable] Since disk_release() calls blk_put_queue() anyway if disk->queue != NULL, fix this by removing the blk_cleanup_queue() call from the pkt_setup_dev() error path. Fixes: commit 523e1d399ce0 ("block: make gendisk hold a reference to its queue") Signed-off-by: Bart Van Assche Cc: Tejun Heo Cc: Maciej S. Szmigiero Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- drivers/block/pktcdvd.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -2745,7 +2745,7 @@ static int pkt_setup_dev(dev_t dev, dev_ pd->pkt_dev = MKDEV(pktdev_major, idx); ret = pkt_new_dev(pd, dev); if (ret) - goto out_new_dev; + goto out_mem2; /* inherit events of the host device */ disk->events = pd->bdev->bd_disk->events; @@ -2763,8 +2763,6 @@ static int pkt_setup_dev(dev_t dev, dev_ mutex_unlock(&ctl_mutex); return 0; -out_new_dev: - blk_cleanup_queue(disk->queue); out_mem2: put_disk(disk); out_mem: