From: Jason Wang <jasowang@redhat.com>
To: davem@davemloft.net, jasowang@redhat.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: mst@redhat.com, Herbert Xu <herbert@gondor.apana.org.au>
Subject: [PATCH net-next] tun: fix issues of iovec iterators using in tun_put_user()
Date: Thu, 13 Nov 2014 16:54:14 +0800 [thread overview]
Message-ID: <1415868854-4913-1-git-send-email-jasowang@redhat.com> (raw)
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 <herbert@gondor.apana.org.au>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
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
next reply other threads:[~2014-11-13 8:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-13 8:54 Jason Wang [this message]
2014-11-13 8:58 ` [PATCH net-next] tun: fix issues of iovec iterators using in tun_put_user() Herbert Xu
2014-11-13 19:35 ` David Miller
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