X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/blobdiff_plain/4531c0a5aef9d8dc028d6f61390bc00c4a4adf86..32240a83d9c8fe11d59b3b97a83e72991b6bfc17:/slip.c

diff --git a/slip.c b/slip.c
index 9e63cb3..aed2551 100644
--- a/slip.c
+++ b/slip.c
@@ -213,6 +213,14 @@ static void userv_deliver_to_kernel(void *sst, struct buffer_if *buf)
 {
     struct userv *st=sst;
 
+    if (buf->size > st->slip.nl.mtu) {
+	Message(M_ERR,"%s: packet of size %"PRIu32" exceeds mtu %"PRIu32":"
+		" cannot be injected into kernel, dropped\n",
+		st->slip.nl.name, buf->size, st->slip.nl.mtu);
+	BUF_FREE(buf);
+	return;
+    }
+
     slip_stuff(&st->slip,buf,st->txfd);
 }