Author: dexuan
Date: Mon Jul 23 17:38:35 2018
New Revision: 336644
URL: https://svnweb.freebsd.org/changeset/base/336644
Log:
MFC: 336426
r336426
hyperv/hn: Fix panic in hypervisor code upon device detach event
Submitted by: hselasky
Reviewed by: dexuan
Differential Revision: https://reviews.freebsd.org/D16139
Modified:
stable/10/sys/dev/hyperv/netvsc/if_hn.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/hyperv/netvsc/if_hn.c
==============================================================================
--- stable/10/sys/dev/hyperv/netvsc/if_hn.c Mon Jul 23 17:35:20 2018
(r336643)
+++ stable/10/sys/dev/hyperv/netvsc/if_hn.c Mon Jul 23 17:38:35 2018
(r336644)
@@ -1157,6 +1157,13 @@ hn_ismyvf(const struct hn_softc *sc, const struct ifne
strcmp(ifp->if_dname, "vlan") == 0)
return (false);
+ /*
+ * During detach events ifp->if_addr might be NULL.
+ * Make sure the bcmp() below doesn't panic on that:
+ */
+ if (ifp->if_addr == NULL || hn_ifp->if_addr == NULL)
+ return (false);
+
if (bcmp(IF_LLADDR(ifp), IF_LLADDR(hn_ifp), ETHER_ADDR_LEN) != 0)
return (false);
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