| Message ID | 20250110083511.30419-6-sgarzare@redhat.com (mailing list archive) |
|---|---|
| State | New |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | vsock: some fixes due to transport de-assignment | expand |
On Fri, Jan 10, 2025 at 09:35:11AM +0100, Stefano Garzarella wrote: >Recent reports have shown how we sometimes call vsock_*_has_data() >when a vsock socket has been de-assigned from a transport (see attached >links), but we shouldn't. > >Previous commits should have solved the real problems, but we may have >more in the future, so to avoid null-ptr-deref, we can return 0 >(no space, no data available) but with a warning. > >This way the code should continue to run in a nearly consistent state >and have a warning that allows us to debug future problems. > >Fixes: c0cfa2d8a788 ("vsock: add multi-transports support") >Cc: stable@vger.kernel.org >Link: https://lore.kernel.org/netdev/Z2K%2FI4nlHdfMRTZC@v4bel-B760M-AORUS-ELITE-AX/ >Link: https://lore.kernel.org/netdev/5ca20d4c-1017-49c2-9516-f6f75fd331e9@rbox.co/ >Link: https://lore.kernel.org/netdev/677f84a8.050a0220.25a300.01b3.GAE@google.com/ >Co-developed-by: Hyunwoo Kim <v4bel@theori.io> >Signed-off-by: Hyunwoo Kim <v4bel@theori.io> >Co-developed-by: Wongi Lee <qwerty@theori.io> >Signed-off-by: Wongi Lee <qwerty@theori.io> >Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> >--- > net/vmw_vsock/af_vsock.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > >diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c >index 74d35a871644..fa9d1b49599b 100644 >--- a/net/vmw_vsock/af_vsock.c >+++ b/net/vmw_vsock/af_vsock.c >@@ -879,6 +879,9 @@ EXPORT_SYMBOL_GPL(vsock_create_connected); > > s64 vsock_stream_has_data(struct vsock_sock *vsk) > { >+ if (WARN_ON(!vsk->transport)) >+ return 0; >+ > return vsk->transport->stream_has_data(vsk); > } > EXPORT_SYMBOL_GPL(vsock_stream_has_data); >@@ -887,6 +890,9 @@ s64 vsock_connectible_has_data(struct vsock_sock *vsk) > { > struct sock *sk = sk_vsock(vsk); > >+ if (WARN_ON(!vsk->transport)) >+ return 0; >+ > if (sk->sk_type == SOCK_SEQPACKET) > return vsk->transport->seqpacket_has_data(vsk); > else >@@ -896,6 +902,9 @@ EXPORT_SYMBOL_GPL(vsock_connectible_has_data); > > s64 vsock_stream_has_space(struct vsock_sock *vsk) > { >+ if (WARN_ON(!vsk->transport)) >+ return 0; >+ > return vsk->transport->stream_has_space(vsk); > } > EXPORT_SYMBOL_GPL(vsock_stream_has_space); >-- >2.47.1 > Reviewed-by: Luigi Leonardi <leonardi@redhat.com> Thanks! Luigi
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 74d35a871644..fa9d1b49599b 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -879,6 +879,9 @@ EXPORT_SYMBOL_GPL(vsock_create_connected); s64 vsock_stream_has_data(struct vsock_sock *vsk) { + if (WARN_ON(!vsk->transport)) + return 0; + return vsk->transport->stream_has_data(vsk); } EXPORT_SYMBOL_GPL(vsock_stream_has_data); @@ -887,6 +890,9 @@ s64 vsock_connectible_has_data(struct vsock_sock *vsk) { struct sock *sk = sk_vsock(vsk); + if (WARN_ON(!vsk->transport)) + return 0; + if (sk->sk_type == SOCK_SEQPACKET) return vsk->transport->seqpacket_has_data(vsk); else @@ -896,6 +902,9 @@ EXPORT_SYMBOL_GPL(vsock_connectible_has_data); s64 vsock_stream_has_space(struct vsock_sock *vsk) { + if (WARN_ON(!vsk->transport)) + return 0; + return vsk->transport->stream_has_space(vsk); } EXPORT_SYMBOL_GPL(vsock_stream_has_space);
Recent reports have shown how we sometimes call vsock_*_has_data() when a vsock socket has been de-assigned from a transport (see attached links), but we shouldn't. Previous commits should have solved the real problems, but we may have more in the future, so to avoid null-ptr-deref, we can return 0 (no space, no data available) but with a warning. This way the code should continue to run in a nearly consistent state and have a warning that allows us to debug future problems. Fixes: c0cfa2d8a788 ("vsock: add multi-transports support") Cc: stable@vger.kernel.org Link: https://lore.kernel.org/netdev/Z2K%2FI4nlHdfMRTZC@v4bel-B760M-AORUS-ELITE-AX/ Link: https://lore.kernel.org/netdev/5ca20d4c-1017-49c2-9516-f6f75fd331e9@rbox.co/ Link: https://lore.kernel.org/netdev/677f84a8.050a0220.25a300.01b3.GAE@google.com/ Co-developed-by: Hyunwoo Kim <v4bel@theori.io> Signed-off-by: Hyunwoo Kim <v4bel@theori.io> Co-developed-by: Wongi Lee <qwerty@theori.io> Signed-off-by: Wongi Lee <qwerty@theori.io> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> --- net/vmw_vsock/af_vsock.c | 9 +++++++++ 1 file changed, 9 insertions(+)