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kern: soclose: don't sleep on SO_LINGER w/ timeout=0

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This is a valid scenario that's handled in the various protocol layers where
it makes sense (e.g., tcp_disconnect and sctp_disconnect). Given that it
indicates we should immediately drop the connection, it makes little sense
to sleep on it.

This could lead to panics with INVARIANTS. On non-INVARIANTS kernels, this
could result in the thread hanging until a signal interrupts it if the
protocol does not mark the socket as disconnected for whatever reason.

Reported by:	syzbot+e625d92c1dd74e402c81@syzkaller.appspotmail.com
Reviewed by:	glebius, markj
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D27407
This commit is contained in:
Kyle Evans 2020-12-04 04:39:48 +00:00
parent df9053920f
commit 34af05ead3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=368326
1 changed files with 2 additions and 1 deletions
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3
sys/kern/uipc_socket.c
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@ -1192,7 +1192,8 @@ soclose(struct socket *so)
goto drop;
}
}
if (so->so_options & SO_LINGER) {
if ((so->so_options & SO_LINGER) != 0 && so->so_linger != 0) {
if ((so->so_state & SS_ISDISCONNECTING) &&
(so->so_state & SS_NBIO))
goto drop;