From: Guy Harris <guy@alum.mit.edu>
Date: Tue, 28 Dec 2010 21:15:26 +0000 (-0800)
Subject: Interface IDs are 0-origin.
X-Git-Tag: libpcap-1.2.1~85^2~16
X-Git-Url: https://git.tcpdump.org/libpcap/commitdiff_plain/028204e0f99f0bad5dfd01add364ebd4f4befabb

Interface IDs are 0-origin.

That means that if an interface ID is greater than *or equal to* the
number of Interface Description Blocks we've seen, we haven't seen an
IDB for that interface.
---

diff --git a/sf-pcap-ng.c b/sf-pcap-ng.c
index 90499915..1554320a 100644
--- a/sf-pcap-ng.c
+++ b/sf-pcap-ng.c
@@ -1053,7 +1053,7 @@ found:
 	/*
 	 * Is the interface ID an interface we know?
 	 */
-	if (interface_id > p->sf.ifcount) {
+	if (interface_id >= p->sf.ifcount) {
 		/*
 		 * Yes.  Fail.
 		 */