From a65a604a01f710defe01f2322e108f4d8c20f6ce Mon Sep 17 00:00:00 2001 From: Jesse Brandeburg Date: Tue, 8 Jul 2008 15:51:32 -0700 Subject: [PATCH] ixgb: don't allow too small MTU Signed-off-by: Jesse Brandeburg Signed-off-by: Jeff Kirsher Signed-off-by: Jeff Garzik --- drivers/net/ixgb/ixgb_main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c index 60cad65dbc..0e72dadf8b 100644 --- a/drivers/net/ixgb/ixgb_main.c +++ b/drivers/net/ixgb/ixgb_main.c @@ -1566,9 +1566,9 @@ ixgb_change_mtu(struct net_device *netdev, int new_mtu) int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; - - if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) - || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) { + /* MTU < 68 is an error for IPv4 traffic, just don't allow it */ + if ((new_mtu < 68) || + (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) { DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu); return -EINVAL; } -- 2.39.5