diff options
| author | Yuan Can <yuancan@huawei.com> | 2022-11-08 13:17:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-14 12:16:46 +0300 |
| commit | eabb3ceb04cddbda22014059d29b8a27fc9607cb (patch) | |
| tree | 2d8ea14bee148ca904074547a6693e12830e83e4 /drivers/vhost | |
| parent | e0f5c962c066e769c187f037fedc883f8abd4e82 (diff) | |
| download | linux-eabb3ceb04cddbda22014059d29b8a27fc9607cb.tar.xz | |
vhost/vsock: Fix error handling in vhost_vsock_init()
[ Upstream commit 7a4efe182ca61fb3e5307e69b261c57cbf434cd4 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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 b0153617fe0e..7bce5f982e58 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -854,7 +854,14 @@ 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) |