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| author | Norbert Slusarek <nslusarek@gmx.net> | 2021-02-05 13:12:06 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-02-06 15:03:17 -0800 |
| commit | 5d1cbcc990f18edaddddef26677073c4e6fad7b7 (patch) | |
| tree | c7b2e72fa255c7080b07753bf70bbd4100b2f067 /net/vmw_vsock | |
| parent | ef66a1eace968ff22a35f45e6e8ec36b668b6116 (diff) | |
| download | linux-5d1cbcc990f18edaddddef26677073c4e6fad7b7.tar.bz2 | |
net/vmw_vsock: fix NULL pointer dereference
In vsock_stream_connect(), a thread will enter schedule_timeout().
While being scheduled out, another thread can enter vsock_stream_connect()
as well and set vsk->transport to NULL. In case a signal was sent, the
first thread can leave schedule_timeout() and vsock_transport_cancel_pkt()
will be called right after. Inside vsock_transport_cancel_pkt(), a null
dereference will happen on transport->cancel_pkt.
Fixes: c0cfa2d8a788 ("vsock: add multi-transports support")
Signed-off-by: Norbert Slusarek <nslusarek@gmx.net>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/trinity-c2d6cede-bfb1-44e2-85af-1fbc7f541715-1612535117028@3c-app-gmx-bap12
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/vmw_vsock')
| -rw-r--r-- | net/vmw_vsock/af_vsock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 6894f21dc147..cb81cfb47a78 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1233,7 +1233,7 @@ static int vsock_transport_cancel_pkt(struct vsock_sock *vsk) { const struct vsock_transport *transport = vsk->transport; - if (!transport->cancel_pkt) + if (!transport || !transport->cancel_pkt) return -EOPNOTSUPP; return transport->cancel_pkt(vsk); |