This patch fixes two issues after using iovec iterators:
- vlan_offset should be initialized to zero, otherwise unexpected offset
will be used in skb_copy_datagram_iter()
- advance iovec iterator when vnet_hdr_sz is greater than sizeof(gso), this
is the case when mergeable rx buffer were enabled for a virt guest.
Fixes e0b46d0ee9c240c7430a47e9b0365674d4a04522 ("tun: Use iovec iterators")
Cc: Herbert Xu <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
---
drivers/net/tun.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 2ff769b..e3fa65a 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1235,7 +1235,7 @@ static ssize_t tun_put_user(struct tun_struct *tun,
{
struct tun_pi pi = { 0, skb->protocol };
ssize_t total;
- int vlan_offset;
+ int vlan_offset = 0;
int vlan_hlen = 0;
int vnet_hdr_sz = 0;
@@ -1304,6 +1304,8 @@ static ssize_t tun_put_user(struct tun_struct *tun,
if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso))
return -EFAULT;
+
+ iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso));
}
if (vlan_hlen) {
--
1.9.1
--
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