Author: ae
Date: Thu Jun 14 09:36:25 2018
New Revision: 335129
URL: https://svnweb.freebsd.org/changeset/base/335129
Log:
Add NULL check like the rest of code has.
It is possible that ifma_protospec becomes NULL in this function for
some entry, but it is still referenced and thus it will not unlinked
from the list. Then "restart" condition triggers and this entry with
NULL ifma_protospec will lead to page fault.
PR: 228982
Modified:
head/sys/netinet6/mld6.c
Modified: head/sys/netinet6/mld6.c
==============================================================================
--- head/sys/netinet6/mld6.c Thu Jun 14 09:29:39 2018 (r335128)
+++ head/sys/netinet6/mld6.c Thu Jun 14 09:36:25 2018 (r335129)
@@ -1679,7 +1679,8 @@ mld_v2_cancel_link_timers(struct mld_ifsoftc *mli)
IF_ADDR_WLOCK(ifp);
restart:
CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) {
- if (ifma->ifma_addr->sa_family != AF_INET6)
+ if (ifma->ifma_addr->sa_family != AF_INET6 ||
+ ifma->ifma_protospec == NULL)
continue;
inm = (struct in6_multi *)ifma->ifma_protospec;
switch (inm->in6m_state) {
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