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zebra: Fix crash in mroute debug

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There exists a possibility that the ifindex we are passed
does not exist and as such we should check for it not
resolving as part of the debug.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2018-08-28 10:35:35 -04:00
parent 3e83237244
commit 5b4256ca42
1 changed files with 7 additions and 5 deletions
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12
zebra/rt_netlink.c
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@ -793,15 +793,17 @@ static int netlink_route_change_read_multicast(struct nlmsghdr *h,
ifp = if_lookup_by_index(oif[count], vrf);
char temp[256];
sprintf(temp, "%s ", ifp->name);
sprintf(temp, "%s(%d) ", ifp ? ifp->name : "Unknown",
oif[count]);
strcat(oif_list, temp);
}
struct zebra_vrf *zvrf = zebra_vrf_lookup_by_id(vrf);
ifp = if_lookup_by_index(iif, vrf);
zlog_debug(
"MCAST VRF: %s(%d) %s (%s,%s) IIF: %s OIF: %s jiffies: %lld",
zvrf->vrf->name, vrf, nl_msg_type_to_str(h->nlmsg_type),
sbuf, gbuf, ifp->name, oif_list, m->lastused);
zlog_debug("MCAST VRF: %s(%d) %s (%s,%s) IIF: %s(%d) OIF: %s jiffies: %lld",
zvrf->vrf->name, vrf,
nl_msg_type_to_str(h->nlmsg_type),
sbuf, gbuf, ifp ? ifp->name : "Unknown", iif,
oif_list, m->lastused);
}
return 0;
}