https://bugzilla.redhat.com/show_bug.cgi?id=1595184 Some domain <interfaces/> do not have a name (because they are not TAP devices). Therefore, if virNetDevTapInterfaceStats(net->ifname, ...) is called an instant crash occurs. In Linux version of the function strlen() is called over the name and in BSD version STREQ() is called. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/util/virnetdevtap.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/util/virnetdevtap.c b/src/util/virnetdevtap.c index bd0710ad2e..2123ffe718 100644 --- a/src/util/virnetdevtap.c +++ b/src/util/virnetdevtap.c @@ -691,6 +691,12 @@ virNetDevTapInterfaceStats(const char *ifname, FILE *fp; char line[256], *colon; + if (!ifname) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Interface not found")); + return -1; + } + fp = fopen("/proc/net/dev", "r"); if (!fp) { virReportSystemError(errno, "%s", @@ -781,7 +787,7 @@ virNetDevTapInterfaceStats(const char *ifname, if (ifa->ifa_addr->sa_family != AF_LINK) continue; - if (STREQ(ifa->ifa_name, ifname)) { + if (STREQ_NULLABLE(ifa->ifa_name, ifname)) { ifd = (struct if_data *)ifa->ifa_data; if (swapped) { stats->tx_bytes = ifd->ifi_ibytes; -- 2.16.4