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net/ulp: prevent ULP without clone op from entering the LISTEN status

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commit 2c02d41d71f90a5168391b6a5f2954112ba2307c upstream.

When an ULP-enabled socket enters the LISTEN status, the listener ULP data
pointer is copied inside the child/accepted sockets by sk_clone_lock().

The relevant ULP can take care of de-duplicating the context pointer via
the clone() operation, but only MPTCP and SMC implement such op.

Other ULPs may end-up with a double-free at socket disposal time.

We can't simply clear the ULP data at clone time, as TLS replaces the
socket ops with custom ones assuming a valid TLS ULP context is
available.

Instead completely prevent clone-less ULP sockets from entering the
LISTEN status.

Fixes: 734942cc4e ("tcp: ULP infrastructure")
Reported-by: slipper <slipper.alive@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Link: https://lore.kernel.org/r/4b80c3d1dbe3d0ab072f80450c202d9bc88b4b03.1672740602.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Abeni
2023-01-03 12:19:17 +01:00
committed by Greg Kroah-Hartman
parent 04941c1d5b
commit dadd0dcaa6
2 changed files with 19 additions and 1 deletions
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4
net/ipv4/tcp_ulp.c
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@@ -136,6 +136,10 @@ static int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)
if (icsk->icsk_ulp_ops)
goto out_err;
err = -EINVAL;
if (!ulp_ops->clone && sk->sk_state == TCP_LISTEN)
goto out_err;
err = ulp_ops->init(sk);
if (err)
goto out_err;