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net/vmw_vsock: fix NULL pointer dereference
commit5d1cbcc990
upstream. 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:c0cfa2d8a7
("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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 1 additions and 1 deletions
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@ -1216,7 +1216,7 @@ static int vsock_transport_cancel_pkt(struct vsock_sock *vsk)
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{
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const struct vsock_transport *transport = vsk->transport;
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if (!transport->cancel_pkt)
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if (!transport || !transport->cancel_pkt)
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return -EOPNOTSUPP;
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return transport->cancel_pkt(vsk);
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