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authorNorbert Slusarek <nslusarek@gmx.net>2021-02-05 15:12:06 +0300
committerJakub Kicinski <kuba@kernel.org>2021-02-07 02:03:17 +0300
commit5d1cbcc990f18edaddddef26677073c4e6fad7b7 (patch)
treec7b2e72fa255c7080b07753bf70bbd4100b2f067 /net/vmw_vsock
parentef66a1eace968ff22a35f45e6e8ec36b668b6116 (diff)
downloadlinux-5d1cbcc990f18edaddddef26677073c4e6fad7b7.tar.xz
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.c2
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);