[net,v3,3/3] net: hns: fixed bug that skb used after kfree

Submitted by yankejian on April 21, 2017, 7:44 a.m.

Details

Message ID 1492760684-117205-4-git-send-email-yankejian@huawei.com
State Changes Requested
Delegated to: David Miller
Headers show

Commit Message

yankejian April 21, 2017, 7:44 a.m.
From: lipeng <lipeng321@huawei.com>

There is KASAN warning which turn out it's a skb used after free:

    BUG: KASAN: use-after-free in hns_nic_net_xmit_hw+0x62c/0x940...
    [17659.112635]      alloc_debug_processing+0x18c/0x1a0
    [17659.117208]      __slab_alloc+0x52c/0x560
    [17659.120909]      kmem_cache_alloc_node+0xac/0x2c0
    [17659.125309]      __alloc_skb+0x6c/0x260
    [17659.128837]      tcp_send_ack+0x8c/0x280
    [17659.132449]      __tcp_ack_snd_check+0x9c/0xf0
    [17659.136587]      tcp_rcv_established+0x5a4/0xa70
    [17659.140899]      tcp_v4_do_rcv+0x27c/0x620
    [17659.144687]      tcp_prequeue_process+0x108/0x170
    [17659.149085]      tcp_recvmsg+0x940/0x1020
    [17659.152787]      inet_recvmsg+0x124/0x180
    [17659.156488]      sock_recvmsg+0x64/0x80
    [17659.160012]      SyS_recvfrom+0xd8/0x180
    [17659.163626]      __sys_trace_return+0x0/0x4
    [17659.167506] INFO: Freed in kfree_skbmem+0xa0/0xb0 age=23 cpu=1 pid=13
    [17659.174000]      free_debug_processing+0x1d4/0x2c0
    [17659.178486]      __slab_free+0x240/0x390
    [17659.182100]      kmem_cache_free+0x24c/0x270
    [17659.186062]      kfree_skbmem+0xa0/0xb0
    [17659.189587]      __kfree_skb+0x28/0x40
    [17659.193025]      napi_gro_receive+0x168/0x1c0
    [17659.197074]      hns_nic_rx_up_pro+0x58/0x90
    [17659.201038]      hns_nic_rx_poll_one+0x518/0xbc0
    [17659.205352]      hns_nic_common_poll+0x94/0x140
    [17659.209576]      net_rx_action+0x458/0x5e0
    [17659.213363]      __do_softirq+0x1b8/0x480
    [17659.217062]      run_ksoftirqd+0x64/0x80
    [17659.220679]      smpboot_thread_fn+0x224/0x310
    [17659.224821]      kthread+0x150/0x170
    [17659.228084]      ret_from_fork+0x10/0x40

    BUG: KASAN: use-after-free in hns_nic_net_xmit+0x8c/0xc0...
    [17751.080490]      __slab_alloc+0x52c/0x560
    [17751.084188]      kmem_cache_alloc+0x244/0x280
    [17751.088238]      __build_skb+0x40/0x150
    [17751.091764]      build_skb+0x28/0x100
    [17751.095115]      __alloc_rx_skb+0x94/0x150
    [17751.098900]      __napi_alloc_skb+0x34/0x90
    [17751.102776]      hns_nic_rx_poll_one+0x180/0xbc0
    [17751.107097]      hns_nic_common_poll+0x94/0x140
    [17751.111333]      net_rx_action+0x458/0x5e0
    [17751.115123]      __do_softirq+0x1b8/0x480
    [17751.118823]      run_ksoftirqd+0x64/0x80
    [17751.122437]      smpboot_thread_fn+0x224/0x310
    [17751.126575]      kthread+0x150/0x170
    [17751.129838]      ret_from_fork+0x10/0x40
    [17751.133454] INFO: Freed in kfree_skbmem+0xa0/0xb0 age=19 cpu=7 pid=43
    [17751.139951]      free_debug_processing+0x1d4/0x2c0
    [17751.144436]      __slab_free+0x240/0x390
    [17751.148051]      kmem_cache_free+0x24c/0x270
    [17751.152014]      kfree_skbmem+0xa0/0xb0
    [17751.155543]      __kfree_skb+0x28/0x40
    [17751.159022]      napi_gro_receive+0x168/0x1c0
    [17751.163074]      hns_nic_rx_up_pro+0x58/0x90
    [17751.167041]      hns_nic_rx_poll_one+0x518/0xbc0
    [17751.171358]      hns_nic_common_poll+0x94/0x140
    [17751.175585]      net_rx_action+0x458/0x5e0
    [17751.179373]      __do_softirq+0x1b8/0x480
    [17751.183076]      run_ksoftirqd+0x64/0x80
    [17751.186691]      smpboot_thread_fn+0x224/0x310
    [17751.190826]      kthread+0x150/0x170
    [17751.194093]      ret_from_fork+0x10/0x40

in drivers/net/ethernet/hisilicon/hns/hns_enet.c

    static netdev_tx_t hns_nic_net_xmit(struct sk_buff *skb,
                                        struct net_device *ndev)
    {
        struct hns_nic_priv *priv = netdev_priv(ndev);
        int ret;

        assert(skb->queue_mapping < ndev->ae_handle->q_num);
        ret = hns_nic_net_xmit_hw(ndev, skb,
                                  &tx_ring_data(priv, skb->queue_mapping));
        if (ret == NETDEV_TX_OK) {
                netif_trans_update(ndev);
                ndev->stats.tx_bytes += skb->len;
                ndev->stats.tx_packets++;
        }
         return (netdev_tx_t)ret;
    }

skb maybe freed in hns_nic_net_xmit_hw() and return NETDEV_TX_OK:

    out_err_tx_ok:

        dev_kfree_skb_any(skb);
        return NETDEV_TX_OK;

This patch fix this bug.

Reported-by: Jun He <hjat2005@huawei.com>
Signed-off-by: lipeng <lipeng321@huawei.com>
Reviewed-by: Yisen Zhuang <yisen.zhuang@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns/hns_enet.c | 22 ++++++++++------------
 drivers/net/ethernet/hisilicon/hns/hns_enet.h |  6 +++---
 2 files changed, 13 insertions(+), 15 deletions(-)

Patch hide | download patch | download mbox

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index fca37e2..1e04df6 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -300,9 +300,9 @@  static void fill_tso_desc(struct hnae_ring *ring, void *priv,
 			     mtu);
 }
 
-int hns_nic_net_xmit_hw(struct net_device *ndev,
-			struct sk_buff *skb,
-			struct hns_nic_ring_data *ring_data)
+netdev_tx_t hns_nic_net_xmit_hw(struct net_device *ndev,
+				struct sk_buff *skb,
+				struct hns_nic_ring_data *ring_data)
 {
 	struct hns_nic_priv *priv = netdev_priv(ndev);
 	struct hnae_ring *ring = ring_data->ring;
@@ -361,6 +361,10 @@  int hns_nic_net_xmit_hw(struct net_device *ndev,
 	dev_queue = netdev_get_tx_queue(ndev, skb->queue_mapping);
 	netdev_tx_sent_queue(dev_queue, skb->len);
 
+	netif_trans_update(ndev);
+	ndev->stats.tx_bytes += skb->len;
+	ndev->stats.tx_packets++;
+
 	wmb(); /* commit all data before submit */
 	assert(skb->queue_mapping < priv->ae_handle->q_num);
 	hnae_queue_xmit(priv->ae_handle->qs[skb->queue_mapping], buf_num);
@@ -1474,17 +1478,11 @@  static netdev_tx_t hns_nic_net_xmit(struct sk_buff *skb,
 				    struct net_device *ndev)
 {
 	struct hns_nic_priv *priv = netdev_priv(ndev);
-	int ret;
 
 	assert(skb->queue_mapping < ndev->ae_handle->q_num);
-	ret = hns_nic_net_xmit_hw(ndev, skb,
-				  &tx_ring_data(priv, skb->queue_mapping));
-	if (ret == NETDEV_TX_OK) {
-		netif_trans_update(ndev);
-		ndev->stats.tx_bytes += skb->len;
-		ndev->stats.tx_packets++;
-	}
-	return (netdev_tx_t)ret;
+
+	return hns_nic_net_xmit_hw(ndev, skb,
+				   &tx_ring_data(priv, skb->queue_mapping));
 }
 
 static int hns_nic_change_mtu(struct net_device *ndev, int new_mtu)
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.h b/drivers/net/ethernet/hisilicon/hns/hns_enet.h
index 5b412de..7bc6a6e 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.h
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.h
@@ -91,8 +91,8 @@  struct hns_nic_priv {
 void hns_nic_net_reset(struct net_device *ndev);
 void hns_nic_net_reinit(struct net_device *netdev);
 int hns_nic_init_phy(struct net_device *ndev, struct hnae_handle *h);
-int hns_nic_net_xmit_hw(struct net_device *ndev,
-			struct sk_buff *skb,
-			struct hns_nic_ring_data *ring_data);
+netdev_tx_t hns_nic_net_xmit_hw(struct net_device *ndev,
+				struct sk_buff *skb,
+				struct hns_nic_ring_data *ring_data);
 
 #endif	/**__HNS_ENET_H */