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nvme: validate cntlid during controller initialisation

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The CNTLID value is required to be unique, and we do rely on this
for correct operation. So reject any controller for which a non-unique
CNTLID has been detected.

Based on a patch from Hannes Reinecke.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
This commit is contained in:
Christoph Hellwig 2019-05-09 09:01:26 +02:00
parent 32fd90c407
commit 1b1031ca63
1 changed files with 24 additions and 17 deletions
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41
drivers/nvme/host/core.c
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@ -2341,20 +2341,35 @@ static const struct attribute_group *nvme_subsys_attrs_groups[] = {
NULL,
};
static int nvme_active_ctrls(struct nvme_subsystem *subsys)
static bool nvme_validate_cntlid(struct nvme_subsystem *subsys,
struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
{
int count = 0;
struct nvme_ctrl *ctrl;
struct nvme_ctrl *tmp;
lockdep_assert_held(&nvme_subsystems_lock);
list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
if (ctrl->state != NVME_CTRL_DELETING &&
ctrl->state != NVME_CTRL_DEAD)
count++;
list_for_each_entry(tmp, &subsys->ctrls, subsys_entry) {
if (ctrl->state == NVME_CTRL_DELETING ||
ctrl->state == NVME_CTRL_DEAD)
continue;
if (tmp->cntlid == ctrl->cntlid) {
dev_err(ctrl->device,
"Duplicate cntlid %u with %s, rejecting\n",
ctrl->cntlid, dev_name(tmp->device));
return false;
}
if ((id->cmic & (1 << 1)) ||
(ctrl->opts && ctrl->opts->discovery_nqn))
continue;
dev_err(ctrl->device,
"Subsystem does not support multiple controllers\n");
return false;
}
return count;
return true;
}
static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
@ -2397,15 +2412,7 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
__nvme_release_subsystem(subsys);
subsys = found;
/*
* Verify that the subsystem actually supports multiple
* controllers, else bail out.
*/
if (!(ctrl->opts && ctrl->opts->discovery_nqn) &&
nvme_active_ctrls(found) && !(id->cmic & (1 << 1))) {
dev_err(ctrl->device,
"ignoring ctrl due to duplicate subnqn (%s).\n",
subsys->subnqn);
if (!nvme_validate_cntlid(subsys, ctrl, id)) {
ret = -EINVAL;
goto out_put_subsystem;
}