1 files changed, 48 insertions, 44 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 27c6d235cbda..b4baa2001a63 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -686,7 +686,6 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
 		if (tun)
 			xdp_rxq_info_unreg(&tfile->xdp_rxq);
 		ptr_ring_cleanup(&tfile->tx_ring, tun_ptr_free);
-		sock_put(&tfile->sk);
 	}
 }
 
@@ -702,6 +701,9 @@ static void tun_detach(struct tun_file *tfile, bool clean)
 	if (dev)
 		netdev_state_change(dev);
 	rtnl_unlock();
+
+	if (clean)
+		sock_put(&tfile->sk);
 }
 
 static void tun_detach_all(struct net_device *dev)
@@ -1459,7 +1461,8 @@ static struct sk_buff *tun_napi_alloc_frags(struct tun_file *tfile,
 	int err;
 	int i;
 
-	if (it->nr_segs > MAX_SKB_FRAGS + 1)
+	if (it->nr_segs > MAX_SKB_FRAGS + 1 ||
+	    len > (ETH_MAX_MTU - NET_SKB_PAD - NET_IP_ALIGN))
 		return ERR_PTR(-EMSGSIZE);
 
 	local_bh_disable();
@@ -1745,7 +1748,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 	u32 rxhash = 0;
 	int skb_xdp = 1;
 	bool frags = tun_napi_frags_enabled(tfile);
-	enum skb_drop_reason drop_reason;
+	enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED;
 
 	if (!(tun->flags & IFF_NO_PI)) {
 		if (len < sizeof(pi))
@@ -1806,10 +1809,9 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 		 * skb was created with generic XDP routine.
 		 */
 		skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp);
-		if (IS_ERR(skb)) {
-			dev_core_stats_rx_dropped_inc(tun->dev);
-			return PTR_ERR(skb);
-		}
+		err = PTR_ERR_OR_ZERO(skb);
+		if (err)
+			goto drop;
 		if (!skb)
 			return total_len;
 	} else {
@@ -1834,13 +1836,9 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 					    noblock);
 		}
 
-		if (IS_ERR(skb)) {
-			if (PTR_ERR(skb) != -EAGAIN)
-				dev_core_stats_rx_dropped_inc(tun->dev);
-			if (frags)
-				mutex_unlock(&tfile->napi_mutex);
-			return PTR_ERR(skb);
-		}
+		err = PTR_ERR_OR_ZERO(skb);
+		if (err)
+			goto drop;
 
 		if (zerocopy)
 			err = zerocopy_sg_from_iter(skb, from);
@@ -1850,27 +1848,14 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 		if (err) {
 			err = -EFAULT;
 			drop_reason = SKB_DROP_REASON_SKB_UCOPY_FAULT;
-drop:
-			dev_core_stats_rx_dropped_inc(tun->dev);
-			kfree_skb_reason(skb, drop_reason);
-			if (frags) {
-				tfile->napi.skb = NULL;
-				mutex_unlock(&tfile->napi_mutex);
-			}
-
-			return err;
+			goto drop;
 		}
 	}
 
 	if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) {
 		atomic_long_inc(&tun->rx_frame_errors);
-		kfree_skb(skb);
-		if (frags) {
-			tfile->napi.skb = NULL;
-			mutex_unlock(&tfile->napi_mutex);
-		}
-
-		return -EINVAL;
+		err = -EINVAL;
+		goto free_skb;
 	}
 
 	switch (tun->flags & TUN_TYPE_MASK) {
@@ -1886,9 +1871,8 @@ drop:
 				pi.proto = htons(ETH_P_IPV6);
 				break;
 			default:
-				dev_core_stats_rx_dropped_inc(tun->dev);
-				kfree_skb(skb);
-				return -EINVAL;
+				err = -EINVAL;
+				goto drop;
 			}
 		}
 
@@ -1930,11 +1914,7 @@ drop:
 			if (ret != XDP_PASS) {
 				rcu_read_unlock();
 				local_bh_enable();
-				if (frags) {
-					tfile->napi.skb = NULL;
-					mutex_unlock(&tfile->napi_mutex);
-				}
-				return total_len;
+				goto unlock_frags;
 			}
 		}
 		rcu_read_unlock();
@@ -1966,17 +1946,25 @@ drop:
 					  skb_headlen(skb));
 
 		if (unlikely(headlen > skb_headlen(skb))) {
+			WARN_ON_ONCE(1);
+			err = -ENOMEM;
 			dev_core_stats_rx_dropped_inc(tun->dev);
+napi_busy:
 			napi_free_frags(&tfile->napi);
 			rcu_read_unlock();
 			mutex_unlock(&tfile->napi_mutex);
-			WARN_ON(1);
-			return -ENOMEM;
+			return err;
 		}
 
-		local_bh_disable();
-		napi_gro_frags(&tfile->napi);
-		local_bh_enable();
+		if (likely(napi_schedule_prep(&tfile->napi))) {
+			local_bh_disable();
+			napi_gro_frags(&tfile->napi);
+			napi_complete(&tfile->napi);
+			local_bh_enable();
+		} else {
+			err = -EBUSY;
+			goto napi_busy;
+		}
 		mutex_unlock(&tfile->napi_mutex);
 	} else if (tfile->napi_enabled) {
 		struct sk_buff_head *queue = &tfile->sk.sk_write_queue;
@@ -2006,6 +1994,22 @@ drop:
 		tun_flow_update(tun, rxhash, tfile);
 
 	return total_len;
+
+drop:
+	if (err != -EAGAIN)
+		dev_core_stats_rx_dropped_inc(tun->dev);
+
+free_skb:
+	if (!IS_ERR_OR_NULL(skb))
+		kfree_skb_reason(skb, drop_reason);
+
+unlock_frags:
+	if (frags) {
+		tfile->napi.skb = NULL;
+		mutex_unlock(&tfile->napi_mutex);
+	}
+
+	return err ?: total_len;
 }
 
 static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from)
@@ -3514,7 +3518,7 @@ static void tun_default_link_ksettings(struct net_device *dev,
 {
 	ethtool_link_ksettings_zero_link_mode(cmd, supported);
 	ethtool_link_ksettings_zero_link_mode(cmd, advertising);
-	cmd->base.speed		= SPEED_10;
+	cmd->base.speed		= SPEED_10000;
 	cmd->base.duplex	= DUPLEX_FULL;
 	cmd->base.port		= PORT_TP;
 	cmd->base.phy_address	= 0;