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authorYunsheng Lin <linyunsheng@huawei.com>2019-12-05 10:12:28 +0800
committerDavid S. Miller <davem@davemloft.net>2019-12-05 14:42:43 -0800
commitd1a37dedcfcf2c01daff5281c3c378876a04e2f4 (patch)
tree6feb0871314133d0fd9ba248e323775d69750b2f /drivers/net/ethernet/hisilicon
parent2a597eff2437d21841a1e87ffa536ab69dbffdcf (diff)
downloadlinux-d1a37dedcfcf2c01daff5281c3c378876a04e2f4.tar.bz2
net: hns3: fix a use after free problem in hns3_nic_maybe_stop_tx()
Currently, hns3_nic_maybe_stop_tx() uses skb_copy() to linearize a SKB if the BD num required by the SKB does not meet the hardware limitation, and it linearizes the SKB by allocating a new linearized SKB and freeing the old SKB, if hns3_nic_maybe_stop_tx() returns -EBUSY because there are no enough space in the ring to send the linearized skb to hardware, the sch_direct_xmit() still hold reference to old SKB and try to retransmit the old SKB when dev_hard_start_xmit() return TX_BUSY, which may cause use after freed problem. This patch fixes it by using __skb_linearize() to linearize the SKB in hns3_nic_maybe_stop_tx(). Fixes: 51e8439f3496 ("net: hns3: add 8 BD limit for tx flow") Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com> Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/hisilicon')
-rw-r--r--drivers/net/ethernet/hisilicon/hns3/hns3_enet.c19
1 files changed, 6 insertions, 13 deletions
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index e2730319bd43..69545dd6c938 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1288,31 +1288,24 @@ static bool hns3_skb_need_linearized(struct sk_buff *skb, unsigned int *bd_size,
static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring,
struct net_device *netdev,
- struct sk_buff **out_skb)
+ struct sk_buff *skb)
{
struct hns3_nic_priv *priv = netdev_priv(netdev);
unsigned int bd_size[HNS3_MAX_TSO_BD_NUM + 1U];
- struct sk_buff *skb = *out_skb;
unsigned int bd_num;
bd_num = hns3_tx_bd_num(skb, bd_size);
if (unlikely(bd_num > HNS3_MAX_NON_TSO_BD_NUM)) {
- struct sk_buff *new_skb;
-
if (bd_num <= HNS3_MAX_TSO_BD_NUM && skb_is_gso(skb) &&
!hns3_skb_need_linearized(skb, bd_size, bd_num))
goto out;
- /* manual split the send packet */
- new_skb = skb_copy(skb, GFP_ATOMIC);
- if (!new_skb)
+ if (__skb_linearize(skb))
return -ENOMEM;
- dev_kfree_skb_any(skb);
- *out_skb = new_skb;
- bd_num = hns3_tx_bd_count(new_skb->len);
- if ((skb_is_gso(new_skb) && bd_num > HNS3_MAX_TSO_BD_NUM) ||
- (!skb_is_gso(new_skb) &&
+ bd_num = hns3_tx_bd_count(skb->len);
+ if ((skb_is_gso(skb) && bd_num > HNS3_MAX_TSO_BD_NUM) ||
+ (!skb_is_gso(skb) &&
bd_num > HNS3_MAX_NON_TSO_BD_NUM))
return -ENOMEM;
@@ -1415,7 +1408,7 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
/* Prefetch the data used later */
prefetch(skb->data);
- ret = hns3_nic_maybe_stop_tx(ring, netdev, &skb);
+ ret = hns3_nic_maybe_stop_tx(ring, netdev, skb);
if (unlikely(ret <= 0)) {
if (ret == -EBUSY) {
u64_stats_update_begin(&ring->syncp);