Author: glebius
Date: Fri Oct 21 22:28:15 2011
New Revision: 226623
URL: http://svn.freebsd.org/changeset/base/226623
Log:
Fix a race: we should update sc_len before dropping the pf lock, otherwise a
number of packets can be queued on sc, while we are in ip_output(), and then
we wipe the accumulated sc_len. On next pfsync_sendout() that would lead to
writing beyond our mbuf cluster.
Modified:
head/sys/contrib/pf/net/if_pfsync.c
Modified: head/sys/contrib/pf/net/if_pfsync.c
==============================================================================
--- head/sys/contrib/pf/net/if_pfsync.c Fri Oct 21 22:12:24 2011
(r226622)
+++ head/sys/contrib/pf/net/if_pfsync.c Fri Oct 21 22:28:15 2011
(r226623)
@@ -2354,6 +2354,7 @@ pfsync_sendout(void)
sc->sc_if.if_obytes += m->m_pkthdr.len;
#endif
+ sc->sc_len = PFSYNC_MINPKT;
#ifdef __FreeBSD__
PF_UNLOCK();
#endif
@@ -2375,9 +2376,6 @@ pfsync_sendout(void)
#ifdef __FreeBSD__
}
#endif
-
- /* start again */
- sc->sc_len = PFSYNC_MINPKT;
}
void
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