From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: [PATCH net] tun: handle copy failure in tun_put_user() Date: Mon, 20 Jan 2014 11:16:48 +0800 Message-ID: <1390187808-5462-1-git-send-email-jasowang@redhat.com> Cc: Jason Wang , "Michael S. Tsirkin" To: davem@davemloft.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org This patch return the error code of copy helpers in tun_put_user() instead of ignoring them. Cc: Michael S. Tsirkin Signed-off-by: Jason Wang --- drivers/net/tun.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index ecec802..4ec8f28 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1185,7 +1185,7 @@ static ssize_t tun_put_user(struct tun_struct *tun, { struct tun_pi pi = { 0, skb->protocol }; ssize_t total = 0; - int vlan_offset = 0, copied; + int vlan_offset = 0, copied, ret; if (!(tun->flags & TUN_NO_PI)) { if ((len -= sizeof(pi)) < 0) @@ -1254,7 +1254,7 @@ static ssize_t tun_put_user(struct tun_struct *tun, if (!vlan_tx_tag_present(skb)) { len = min_t(int, skb->len, len); } else { - int copy, ret; + int copy; struct { __be16 h_vlan_proto; __be16 h_vlan_TCI; @@ -1282,13 +1282,13 @@ static ssize_t tun_put_user(struct tun_struct *tun, goto done; } - skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len); + ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len); done: tun->dev->stats.tx_packets++; tun->dev->stats.tx_bytes += len; - return total; + return ret ? ret : total; } static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, -- 1.8.3.2