From: Israel Rukshin <israelr@xxxxxxxxxx>
[ Upstream commit e3e19dcc4c416d65f99f13d55be2b787f8d0050e ]
When a port is removed through configfs, any connected controllers
are starting teardown flow asynchronously and can still send commands.
This causes a use-after-free bug for any command that dereferences
req->port (like in nvmet_parse_io_cmd).
To fix this, wait for all the teardown scheduled works to complete
(like release_work at rdma/tcp drivers). This ensures there are no
active controllers when the port is eventually removed.
Signed-off-by: Israel Rukshin <israelr@xxxxxxxxxx>
Reviewed-by: Max Gurtovoy <mgurtovoy@xxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/nvme/target/configfs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 37e1d7784e175..9aed5cc710960 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -1462,6 +1462,8 @@ static void nvmet_port_release(struct config_item *item)
{
struct nvmet_port *port = to_nvmet_port(item);
+ /* Let inflight controllers teardown complete */
+ flush_scheduled_work();
list_del(&port->global_entry);
kfree(port->ana_state);
--
2.33.0
