netdev - [PATCH AUTOSEL 4.9 3/4] phonet/pep: refuse to enable an unbound pipe

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Message-Id: <20211227190647.1043514-3-sashal@kernel.org>
Date:   Mon, 27 Dec 2021 14:06:45 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Rémi Denis-Courmont <remi@...lab.net>,
        syzbot+2dc91e7fc3dea88b1e8a@...kaller.appspotmail.com,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, courmisch@...il.com,
        kuba@...nel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 3/4] phonet/pep: refuse to enable an unbound pipe

From: Rémi Denis-Courmont <remi@...lab.net>

[ Upstream commit 75a2f31520095600f650597c0ac41f48b5ba0068 ]

This ioctl() implicitly assumed that the socket was already bound to
a valid local socket name, i.e. Phonet object. If the socket was not
bound, two separate problems would occur:

1) We'd send an pipe enablement request with an invalid source object.
2) Later socket calls could BUG on the socket unexpectedly being
   connected yet not bound to a valid object.

Reported-by: syzbot+2dc91e7fc3dea88b1e8a@...kaller.appspotmail.com
Signed-off-by: Rémi Denis-Courmont <remi@...lab.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/phonet/pep.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index f6aa532bcbf64..1e7945df39928 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -956,6 +956,8 @@ static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
 			ret =  -EBUSY;
 		else if (sk->sk_state == TCP_ESTABLISHED)
 			ret = -EISCONN;
+		else if (!pn->pn_sk.sobject)
+			ret = -EADDRNOTAVAIL;
 		else
 			ret = pep_sock_enable(sk, NULL, 0);
 		release_sock(sk);
-- 
2.34.1