Author: ae
Date: Wed Nov 18 13:52:13 2020
New Revision: 367790
URL: https://svnweb.freebsd.org/changeset/base/367790
Log:
MFC r367594:
Fix possible NULL pointer dereference.
lagg(4) replaces if_output method of its child interfaces and expects
that this method can be called only by child interfaces. But it is
possible that lagg_port_output() could be called by children of child
interfaces. In this case ifnet's if_lagg field is NULL. Add check that
lp is not NULL.
Modified:
stable/12/sys/net/if_lagg.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/net/if_lagg.c
==============================================================================
--- stable/12/sys/net/if_lagg.c Wed Nov 18 13:47:11 2020 (r367789)
+++ stable/12/sys/net/if_lagg.c Wed Nov 18 13:52:13 2020 (r367790)
@@ -1033,7 +1033,8 @@ lagg_port_output(struct ifnet *ifp, struct mbuf *m,
switch (dst->sa_family) {
case pseudo_AF_HDRCMPLT:
case AF_UNSPEC:
- return ((*lp->lp_output)(ifp, m, dst, ro));
+ if (lp != NULL)
+ return ((*lp->lp_output)(ifp, m, dst, ro));
}
/* drop any other frames */
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