[PATCH 4.14 204/237] virtio-mmio: fix missing put_device() when vm_cmdline_parent registration failed

From: Greg Kroah-Hartman
Date: Thu Jun 23 2022 - 13:43:40 EST


From: chengkaitao <pilgrimtao@xxxxxxxxx>

[ Upstream commit a58a7f97ba11391d2d0d408e0b24f38d86ae748e ]

The reference must be released when device_register(&vm_cmdline_parent)
failed. Add the corresponding 'put_device()' in the error handling path.

Signed-off-by: chengkaitao <pilgrimtao@xxxxxxxxx>
Message-Id: <20220602005542.16489-1-chengkaitao@xxxxxxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/virtio/virtio_mmio.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 74dc7170fd35..181386e06cb7 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -635,6 +635,7 @@ static int vm_cmdline_set(const char *device,
if (!vm_cmdline_parent_registered) {
err = device_register(&vm_cmdline_parent);
if (err) {
+ put_device(&vm_cmdline_parent);
pr_err("Failed to register parent device!\n");
return err;
}
--
2.35.1