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nvme-multipath: avoid crash on invalid subsystem cntlid enumeration 

A process holding an open reference to a removed disk prevents it
from completing deletion, so its name continues to exist. A subsequent
gendisk creation may have the same cntlid which risks collision when
using that for the name. Use the unique ctrl->instance instead.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke 2019-05-03 15:37:35 +02:00 committed by Christoph Hellwig
parent 8730c1ddb6
commit 8a03b27ea6
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/host/multipath.c
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@ -31,7 +31,7 @@ void nvme_set_disk_name(char *disk_name, struct nvme_ns *ns,
sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance);
} else if (ns->head->disk) {
sprintf(disk_name, "nvme%dc%dn%d", ctrl->subsys->instance,
ctrl->cntlid, ns->head->instance);
ctrl->instance, ns->head->instance);
*flags = GENHD_FL_HIDDEN;
} else {
sprintf(disk_name, "nvme%dn%d", ctrl->subsys->instance,