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phonet/pep: refuse to enable an unbound pipe 

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@syzkaller.appspotmail.com
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rémi Denis-Courmont 2021-12-19 19:03:39 +02:00 committed by David S. Miller
parent 662f11d55f
commit 75a2f31520
1 changed files with 2 additions and 0 deletions
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2
net/phonet/pep.c
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@ -947,6 +947,8 @@ 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);