phonet/pep: refuse to enable an unbound pipe
authorRémi Denis-Courmont <remi@remlab.net>
Sun, 19 Dec 2021 17:03:39 +0000 (19:03 +0200)
committerDavid S. Miller <davem@davemloft.net>
Mon, 20 Dec 2021 11:49:51 +0000 (11:49 +0000)
commit75a2f31520095600f650597c0ac41f48b5ba0068
tree3bf4114fa31c3388547618e70e5191b9506de0a2
parent662f11d55ffd02933e1bd275d732b97eddccf870
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>
net/phonet/pep.c