tun: Fix GSO meta-data handling in tun_get_user

When we write the GSO meta-data in tun_get_user we end up advancing
the IO vector twice, thus exhausting the user buffer before we can
finish writing the packet.

Fixes: f5ff53b4d97c ("{macvtap,tun}_get_user(): switch to iov_iter")
Reported-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 4b743c6..6d44da1 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1052,7 +1052,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 
                if (gso.hdr_len > len)
                        return -EINVAL;
-               iov_iter_advance(from, tun->vnet_hdr_sz);
+               iov_iter_advance(from, tun->vnet_hdr_sz - sizeof(gso));
        }
 
        if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) {