diff options
Diffstat (limited to 'freebsd/sys/netinet6/udp6_usrreq.c')
| -rw-r--r-- | freebsd/sys/netinet6/udp6_usrreq.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/freebsd/sys/netinet6/udp6_usrreq.c b/freebsd/sys/netinet6/udp6_usrreq.c index e0fcd06d..270b4880 100644 --- a/freebsd/sys/netinet6/udp6_usrreq.c +++ b/freebsd/sys/netinet6/udp6_usrreq.c @@ -744,9 +744,24 @@ udp6_output(struct socket *so, int flags_arg, struct mbuf *m, * - when we are not bound to an address and source port (it is * in6_pcbsetport() which will require the write lock). */ +retry: if (sin6 == NULL || (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) && inp->inp_lport == 0)) { INP_WLOCK(inp); + /* + * In case we lost a race and another thread bound addr/port + * on the inp we cannot keep the wlock (which still would be + * fine) as further down, based on these values we make + * decisions for the pcbinfo lock. If the locks are not in + * synch the assertions on unlock will fire, hence we go for + * one retry loop. + */ + if (sin6 != NULL && + (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) || + inp->inp_lport != 0)) { + INP_WUNLOCK(inp); + goto retry; + } unlock_inp = UH_WLOCKED; } else { INP_RLOCK(inp); |