From b5623511c673db28badf5b6f12807af334b47abf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juhani=20Krekel=C3=A4?= <juhani@krekelä.fi>
Date: Thu, 4 Jul 2019 12:28:56 +0300
Subject: [PATCH] Handle overlong frames like runt frames

---
 ethertype-dump.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/ethertype-dump.c b/ethertype-dump.c
index 4499385..81aa195 100644
--- a/ethertype-dump.c
+++ b/ethertype-dump.c
@@ -82,6 +82,14 @@ int main(int argc, char **argv) {
 			continue;
 		}
 
+		if (frame_length > 1522) {
+			errno = 0;
+			if (printf("Overlong frame (%zdB)\n", frame_length) == -1) {
+				err(1, "printf");
+			}
+			continue;
+		}
+
 		// Extract the MACs
 		// 012345 012345
 		// dest   source