ehea: fix use after free

ehea_start_xmit() dereferences skb after its freeing in ehea_xmit3() to
get vlan tags.

Move the offending block before the potential ehea_xmit3() call.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index bb7d306..e59d386 100644 (file)
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -2249,6 +2249,11 @@ static int ehea_start_xmit(struct sk_buff *skb, struct net_device *dev)
        memset(swqe, 0, SWQE_HEADER_SIZE);
        atomic_dec(&pr->swqe_avail);
 
+       if (vlan_tx_tag_present(skb)) {
+               swqe->tx_control |= EHEA_SWQE_VLAN_INSERT;
+               swqe->vlan_tag = vlan_tx_tag_get(skb);
+       }
+
        if (skb->len <= SWQE3_MAX_IMM) {
                u32 sig_iv = port->sig_comp_iv;
                u32 swqe_num = pr->swqe_id_counter;
@@ -2279,11 +2284,6 @@ static int ehea_start_xmit(struct sk_buff *skb, struct net_device *dev)
        }
        pr->swqe_id_counter += 1;
 
-       if (vlan_tx_tag_present(skb)) {
-               swqe->tx_control |= EHEA_SWQE_VLAN_INSERT;
-               swqe->vlan_tag = vlan_tx_tag_get(skb);
-       }
-
        if (netif_msg_tx_queued(port)) {
                ehea_info("post swqe on QP %d", pr->qp->init_attr.qp_nr);
                ehea_dump(swqe, 512, "swqe");