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Message-Id: <20211227151322.424618589@linuxfoundation.org>
Date: Mon, 27 Dec 2021 16:31:23 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
syzbot+2dc91e7fc3dea88b1e8a@...kaller.appspotmail.com,
Rémi Denis-Courmont <remi@...lab.net>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.4 47/47] phonet/pep: refuse to enable an unbound pipe
From: Rémi Denis-Courmont <remi@...lab.net>
commit 75a2f31520095600f650597c0ac41f48b5ba0068 upstream.
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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
net/phonet/pep.c | 2 ++
1 file changed, 2 insertions(+)
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -946,6 +946,8 @@ static int pep_ioctl(struct sock *sk, in
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);
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