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 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: pktcdvd-fix-pkt_setup_dev-error-path.patch and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 5a0ec388ef0f6e33841aeb810d7fa23f049ec4cd Mon Sep 17 00:00:00 2001
From: Bart Van Assche bart.vanassche@wdc.com Date: Tue, 2 Jan 2018 11:39:47 -0800 Subject: pktcdvd: Fix pkt_setup_dev() error path
From: Bart Van Assche bart.vanassche@wdc.com
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@wdc.com Cc: Tejun Heo tj@kernel.org Cc: Maciej S. Szmigiero mail@maciej.szmigiero.name Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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:
Patches currently in stable-queue which might be from bart.vanassche@wdc.com are
queue-4.15/pktcdvd-fix-pkt_setup_dev-error-path.patch queue-4.15/pktcdvd-fix-a-recently-introduced-null-pointer-dereference.patch