diff options
| author | Yuan Can <yuancan@huawei.com> | 2022-11-08 10:17:05 +0000 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-12-28 05:28:10 -0500 |
| commit | 7a4efe182ca61fb3e5307e69b261c57cbf434cd4 (patch) | |
| tree | 3a139679f86815dbd8c4a1bae4b7a8b897fe4d97 /drivers/vhost | |
| parent | aeca7ff254843d49a8739f07f7dab1341450111d (diff) | |
| download | linux-7a4efe182ca61fb3e5307e69b261c57cbf434cd4.tar.bz2 | |
vhost/vsock: Fix error handling in vhost_vsock_init()
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.
Fixes: 433fc58e6bf2 ("VSOCK: Introduce vhost_vsock.ko")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Message-Id: <20221108101705.45981-1-yuancan@huawei.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vsock.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index cd6f7776013a..a2b374372363 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) |