X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=slip.c;h=aed2551de70d2d695ec1ef99e04081923227dabf;hb=dbe11c2091cfdb8f99f032a9ed81321b09c4094e;hp=9e63cb3cd6f3714c37524ca10f1e66f70c6cf9a1;hpb=a28d65a5e8624c92be4fc3c4a9d8a0d46d92dcc5;p=secnet.git

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);
 }