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nvmet: Fix use-after-free bug when a port is removed

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When a port is removed through configfs, any connected controllers
are still active and can still send commands. This causes a
use-after-free bug which is detected by KASAN for any admin command
that dereferences req->port (like in nvmet_execute_identify_ctrl).

To fix this, disconnect all active controllers when a subsystem is
removed from a port. This ensures there are no active controllers
when the port is eventually removed.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by : Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Logan Gunthorpe 2019-07-31 17:35:31 -06:00 committed by Sagi Grimberg
parent fab7772bfb
commit 3aed86731e
3 changed files with 16 additions and 0 deletions
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1
drivers/nvme/target/configfs.c
View File

@ -675,6 +675,7 @@ static void nvmet_port_subsys_drop_link(struct config_item *parent,
found:
list_del(&p->entry);
nvmet_port_del_ctrls(port, subsys);
nvmet_port_disc_changed(port, subsys);
if (list_empty(&port->subsystems))

12
drivers/nvme/target/core.c
View File

@ -280,6 +280,18 @@ void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops)
}
EXPORT_SYMBOL_GPL(nvmet_unregister_transport);
void nvmet_port_del_ctrls(struct nvmet_port *port, struct nvmet_subsys *subsys)
{
struct nvmet_ctrl *ctrl;
mutex_lock(&subsys->lock);
list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
if (ctrl->port == port)
ctrl->ops->delete_ctrl(ctrl);
}
mutex_unlock(&subsys->lock);
}
int nvmet_enable_port(struct nvmet_port *port)
{
const struct nvmet_fabrics_ops *ops;

3
drivers/nvme/target/nvmet.h
View File

@ -418,6 +418,9 @@ void nvmet_port_send_ana_event(struct nvmet_port *port);
int nvmet_register_transport(const struct nvmet_fabrics_ops *ops);
void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops);
void nvmet_port_del_ctrls(struct nvmet_port *port,
struct nvmet_subsys *subsys);
int nvmet_enable_port(struct nvmet_port *port);
void nvmet_disable_port(struct nvmet_port *port);