4 files changed, 35 insertions, 6 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 5e78923dfd63..923faa5fdc5b 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4550,7 +4550,6 @@ static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
 	skb_reset_mac_header(skb);
 	skb_gro_reset_offset(skb);
 
-	eth = skb_gro_header_fast(skb, 0);
 	if (unlikely(skb_gro_header_hard(skb, hlen))) {
 		eth = skb_gro_header_slow(skb, hlen, 0);
 		if (unlikely(!eth)) {
@@ -4558,6 +4557,7 @@ static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
 			return NULL;
 		}
 	} else {
+		eth = (const struct ethhdr *)skb->data;
 		gro_pull_from_frag0(skb, hlen);
 		NAPI_GRO_CB(skb)->frag0 += hlen;
 		NAPI_GRO_CB(skb)->frag0_len -= hlen;
@@ -6986,7 +6986,7 @@ static void netdev_wait_allrefs(struct net_device *dev)
 
 		refcnt = netdev_refcnt_read(dev);
 
-		if (time_after(jiffies, warning_time + 10 * HZ)) {
+		if (refcnt && time_after(jiffies, warning_time + 10 * HZ)) {
 			pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
 				 dev->name, refcnt);
 			warning_time = jiffies;
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 9a53c66deb64..66428c0eb663 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -428,8 +428,13 @@ static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
 		if (rc >= 0)
 			info.n_priv_flags = rc;
 	}
-	if (ops->get_regs_len)
-		info.regdump_len = ops->get_regs_len(dev);
+	if (ops->get_regs_len) {
+		int ret = ops->get_regs_len(dev);
+
+		if (ret > 0)
+			info.regdump_len = ret;
+	}
+
 	if (ops->get_eeprom_len)
 		info.eedump_len = ops->get_eeprom_len(dev);
 
@@ -883,6 +888,9 @@ static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
 		return -EFAULT;
 
 	reglen = ops->get_regs_len(dev);
+	if (reglen <= 0)
+		return reglen;
+
 	if (regs.len > reglen)
 		regs.len = reglen;
 
@@ -893,13 +901,16 @@ static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
 			return -ENOMEM;
 	}
 
+	if (regs.len < reglen)
+		reglen = regs.len;
+
 	ops->get_regs(dev, &regs, regbuf);
 
 	ret = -EFAULT;
 	if (copy_to_user(useraddr, &regs, sizeof(regs)))
 		goto out;
 	useraddr += offsetof(struct ethtool_regs, data);
-	if (regbuf && copy_to_user(useraddr, regbuf, regs.len))
+	if (copy_to_user(useraddr, regbuf, reglen))
 		goto out;
 	ret = 0;
 
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 78dc184072e8..9d812ba38ff2 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -30,6 +30,7 @@
 #include <linux/times.h>
 #include <net/net_namespace.h>
 #include <net/neighbour.h>
+#include <net/arp.h>
 #include <net/dst.h>
 #include <net/sock.h>
 #include <net/netevent.h>
@@ -2490,7 +2491,13 @@ int neigh_xmit(int index, struct net_device *dev,
 		if (!tbl)
 			goto out;
 		rcu_read_lock_bh();
-		neigh = __neigh_lookup_noref(tbl, addr, dev);
+		if (index == NEIGH_ARP_TABLE) {
+			u32 key = *((u32 *)addr);
+
+			neigh = __ipv4_neigh_lookup_noref(dev, key);
+		} else {
+			neigh = __neigh_lookup_noref(tbl, addr, dev);
+		}
 		if (!neigh)
 			neigh = __neigh_create(tbl, addr, dev, false);
 		err = PTR_ERR(neigh);
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index b6327601f979..4ea957c1e7ee 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -3139,7 +3139,13 @@ static int pktgen_wait_thread_run(struct pktgen_thread *t)
 {
 	while (thread_is_running(t)) {
 
+		/* note: 't' will still be around even after the unlock/lock
+		 * cycle because pktgen_thread threads are only cleared at
+		 * net exit
+		 */
+		mutex_unlock(&pktgen_thread_lock);
 		msleep_interruptible(100);
+		mutex_lock(&pktgen_thread_lock);
 
 		if (signal_pending(current))
 			goto signal;
@@ -3154,6 +3160,10 @@ static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
 	struct pktgen_thread *t;
 	int sig = 1;
 
+	/* prevent from racing with rmmod */
+	if (!try_module_get(THIS_MODULE))
+		return sig;
+
 	mutex_lock(&pktgen_thread_lock);
 
 	list_for_each_entry(t, &pn->pktgen_threads, th_list) {
@@ -3167,6 +3177,7 @@ static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
 			t->control |= (T_STOP);
 
 	mutex_unlock(&pktgen_thread_lock);
+	module_put(THIS_MODULE);
 	return sig;
 }