From: Eric Dumazet Date: Tue, 26 Oct 2010 19:21:07 +0000 (+0000) Subject: ehea: fix use after free X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e5ccd96110d5ac0f73b695ba606feb6d69472f26;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git 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 Signed-off-by: Breno Leitao Signed-off-by: David S. Miller --- diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c index bb7d306fb446..e59d38629099 100644 --- 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");