[src/trunk]: src/sys/dev/usb if the pkt length in rx header is < ETHER_HDR_LE...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/894e769d1fd3
branches:  trunk
changeset: 332421:894e769d1fd3
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Sat Sep 20 15:07:06 2014 +0000

description:
if the pkt length in rx header is < ETHER_HDR_LEN, drop it

diffstat:

 sys/dev/usb/if_smsc.c |  9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diffs (23 lines):

diff -r 80a3f78dbba6 -r 894e769d1fd3 sys/dev/usb/if_smsc.c
--- a/sys/dev/usb/if_smsc.c     Sat Sep 20 11:16:05 2014 +0000
+++ b/sys/dev/usb/if_smsc.c     Sat Sep 20 15:07:06 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_smsc.c,v 1.21 2014/09/14 21:06:12 jmcneill Exp $    */
+/*     $NetBSD: if_smsc.c,v 1.22 2014/09/20 15:07:06 jmcneill Exp $    */
 
 /*     $OpenBSD: if_smsc.c,v 1.4 2012/09/27 12:38:11 jsg Exp $ */
 /* $FreeBSD: src/sys/dev/usb/net/if_smsc.c,v 1.1 2012/08/15 04:03:55 gonzo Exp $ */
@@ -1304,6 +1304,13 @@
                smsc_dbg_printf(sc, "rxeof total_len %d pktlen %d rxhdr "
                    "0x%08x\n", total_len, pktlen, rxhdr);
 
+               if (pktlen < ETHER_HDR_LEN) {
+                       smsc_dbg_printf(sc, "pktlen %d < ETHER_HDR_LEN %d\n",
+                           pktlen, ETHER_HDR_LEN);
+                       ifp->if_ierrors++;
+                       goto done;
+               }
+
                pktlen += ETHER_ALIGN;
 
                if (pktlen > MCLBYTES) {