linux-kernel - [PATCH] virtio-mmio: fix missing put_device() when vm_cmdline

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Date:   Thu,  2 Jun 2022 08:55:42 +0800
From:   chengkaitao <pilgrimtao@...il.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, smcdef@...il.com,
        chengkaitao <pilgrimtao@...il.com>
Subject: [PATCH] virtio-mmio: fix missing put_device() when vm_cmdline_parent registration failed

From: chengkaitao <pilgrimtao@...il.com>

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@...il.com>
---
 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 56128b9c46eb..1dd396d4bebb 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -688,6 +688,7 @@ 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;
 		}
-- 
2.14.1