Re: [PATCH] vhost/vsock: Fix error handling in vhost_vsock_init()

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On Tue, Nov 08, 2022 at 09:13:57AM +0000, Yuan Can wrote:
A problem about modprobe vhost_vsock failed is triggered with the
following log given:

modprobe: ERROR: could not insert 'vhost_vsock': Device or resource busy

The reason is that vhost_vsock_init() returns misc_register() directly
without checking its return value, if misc_register() failed, it returns
without calling vsock_core_unregister() on vhost_transport, resulting the
vhost_vsock can never be installed later.
A simple call graph is shown as below:

vhost_vsock_init()
  vsock_core_register() # register vhost_transport
  misc_register()
    device_create_with_groups()
      device_create_groups_vargs()
        dev = kzalloc(...) # OOM happened
  # return without unregister vhost_transport

Fix by calling vsock_core_unregister() when misc_register() returns error.

Thanks for this fix!


Fixes: c0cfa2d8a788 ("vsock: add multi-transports support")

Is this the right tag?

It seems to me that since the introduction of vhost-vsock we have the same problem (to be solved differently, because with the introduction of multi-transport we refactored the initialization functions).

So should we use 433fc58e6bf2 ("VSOCK: Introduce vhost_vsock.ko")?

Thanks,
Stefano

Signed-off-by: Yuan Can <yuancan@xxxxxxxxxx>
---
drivers/vhost/vsock.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 5703775af129..10a7d23731fe 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -959,7 +959,14 @@ static int __init vhost_vsock_init(void)
				  VSOCK_TRANSPORT_F_H2G);
	if (ret < 0)
		return ret;
-	return misc_register(&vhost_vsock_misc);
+
+	ret = misc_register(&vhost_vsock_misc);
+	if (ret) {
+		vsock_core_unregister(&vhost_transport.transport);
+		return ret;
+	}
+
+	return 0;
};

static void __exit vhost_vsock_exit(void)
--
2.17.1


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