qeth: avoid skb_under_panic for malformatted inbound data

To make the qeth driver more robust in case of malformatted inbound
packets due to hardware problems, an additional check for
OSN-card-type is added for OSN-type packets.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 8 insertions, 5 deletions

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index fdf4ffa2e714..1b1e80336d2c 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -449,12 +449,15 @@ static void qeth_l2_process_inbound_buffer(struct qeth_card *card,
                         netif_rx(skb);
                         break;
                 case QETH_HEADER_TYPE_OSN:
-                        skb_push(skb, sizeof(struct qeth_hdr));
-                        skb_copy_to_linear_data(skb, hdr,
+                        if (card->info.type == QETH_CARD_TYPE_OSN) {
+                                skb_push(skb, sizeof(struct qeth_hdr));
+                                skb_copy_to_linear_data(skb, hdr,
                                                 sizeof(struct qeth_hdr));
-                        len = skb->len;
-                        card->osn_info.data_cb(skb);
-                        break;
+                                len = skb->len;
+                                card->osn_info.data_cb(skb);
+                                break;
+                        }
+                        /* else unknown */
                 default:
                         dev_kfree_skb_any(skb);
                         QETH_DBF_TEXT(TRACE, 3, "inbunkno");