Patch "pktcdvd: Fix pkt_setup_dev() error path" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

pktcdvd: Fix pkt_setup_dev() error path

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
pktcdvd-fix-pkt_setup_dev-error-path.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Bart Van Assche <[email protected]>
Date: Tue, 2 Jan 2018 11:39:47 -0800
Subject: pktcdvd: Fix pkt_setup_dev() error path

From: Bart Van Assche <[email protected]>

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.

---
 drivers/block/pktcdvd.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

@@ -2779,7 +2779,7 @@ 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;

@@ -2797,8 +2797,6 @@ 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:

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/pktcdvd-fix-pkt_setup_dev-error-path.patch