[PATCH net 1/2] tun: unbreak truncated packet signalling

[Jason Wang <jasowang@redhat.com>]

Commit 6680ec68eff47d36f67b4351bc9836fd6cba9532
(tuntap: hardware vlan tx support) breaks the truncated packet signal by never
return a length greater than iov length in tun_put_user(). This patch fixes this
by always return the length of packet plus possible vlan header. Caller can
detect the truncated packet by comparing the return value and the size of iov
length.

Reported-by: Vlad Yasevich <vyasevich@gmail.com>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
The patch is needed for stable.
---
 drivers/net/tun.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index e26cbea..dd1bd7a 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1183,7 +1183,11 @@ static ssize_t tun_put_user(struct tun_struct *tun,
 			    const struct iovec *iv, int len)
 {
 	struct tun_pi pi = { 0, skb->protocol };
-	ssize_t total = 0;
+	struct {
+		__be16 h_vlan_proto;
+		__be16 h_vlan_TCI;
+	} veth;
+	ssize_t total = 0, off = 0;
 	int vlan_offset = 0;
 
 	if (!(tun->flags & TUN_NO_PI)) {
@@ -1248,14 +1252,11 @@ static ssize_t tun_put_user(struct tun_struct *tun,
 		total += tun->vnet_hdr_sz;
 	}
 
+	off = total;
 	if (!vlan_tx_tag_present(skb)) {
 		len = min_t(int, skb->len, len);
 	} else {
 		int copy, ret;
-		struct {
-			__be16 h_vlan_proto;
-			__be16 h_vlan_TCI;
-		} veth;
 
 		veth.h_vlan_proto = skb->vlan_proto;
 		veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb));
@@ -1264,22 +1265,22 @@ static ssize_t tun_put_user(struct tun_struct *tun,
 		len = min_t(int, skb->len + VLAN_HLEN, len);
 
 		copy = min_t(int, vlan_offset, len);
-		ret = skb_copy_datagram_const_iovec(skb, 0, iv, total, copy);
+		ret = skb_copy_datagram_const_iovec(skb, 0, iv, off, copy);
 		len -= copy;
-		total += copy;
+		off += copy;
 		if (ret || !len)
 			goto done;
 
 		copy = min_t(int, sizeof(veth), len);
-		ret = memcpy_toiovecend(iv, (void *)&veth, total, copy);
+		ret = memcpy_toiovecend(iv, (void *)&veth, off, copy);
 		len -= copy;
-		total += copy;
+		off += copy;
 		if (ret || !len)
 			goto done;
 	}
 
-	skb_copy_datagram_const_iovec(skb, vlan_offset, iv, total, len);
-	total += len;
+	skb_copy_datagram_const_iovec(skb, vlan_offset, iv, off, len);
+	total += skb->len + (vlan_offset ? sizeof(veth) : 0);
 
 done:
 	tun->dev->stats.tx_packets++;
-- 
1.8.3.2