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 <stable@xxxxxxxxxxxxxxx> know about it.
>From 5a0ec388ef0f6e33841aeb810d7fa23f049ec4cd Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@xxxxxxx>
Date: Tue, 2 Jan 2018 11:39:47 -0800
Subject: pktcdvd: Fix pkt_setup_dev() error path
From: Bart Van Assche <bart.vanassche@xxxxxxx>
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 <bart.vanassche@xxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Maciej S. Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/pktcdvd.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -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 bart.vanassche@xxxxxxx are
queue-4.4/pktcdvd-fix-pkt_setup_dev-error-path.patch