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authorSven Eckelmann <sven@narfation.org>2017-01-28 10:12:39 +0100
committerSimon Wunderlich <sw@simonwunderlich.de>2017-01-28 10:40:35 +0100
commit7c946062b3ae2b7f002383e5e402113e98ad3c77 (patch)
tree03db0aab75359f626c79d66553331a3aee6d3823 /net
parentc33705188c493b7de3b8dc2956d67de91b444727 (diff)
batman-adv: Fix double call of dev_queue_xmit
The net_xmit_eval has side effects because it is not making sure that e isn't evaluated twice. #define net_xmit_eval(e) ((e) == NET_XMIT_CN ? 0 : (e)) The code requested by David Miller [1] return net_xmit_eval(dev_queue_xmit(skb)); will get transformed into return ((dev_queue_xmit(skb)) == NET_XMIT_CN ? 0 : (dev_queue_xmit(skb))) dev_queue_xmit will therefore be tried again (with an already consumed skb) whenever the return code is not NET_XMIT_CN. [1] https://lkml.kernel.org/r/20170125.225624.965229145391320056.davem@davemloft.net Fixes: c33705188c49 ("batman-adv: Treat NET_XMIT_CN as transmit successfully") Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Diffstat (limited to 'net')
-rw-r--r--net/batman-adv/send.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
index d9b2889064a6..1489ec27daff 100644
--- a/net/batman-adv/send.c
+++ b/net/batman-adv/send.c
@@ -77,6 +77,7 @@ int batadv_send_skb_packet(struct sk_buff *skb,
{
struct batadv_priv *bat_priv;
struct ethhdr *ethhdr;
+ int ret;
bat_priv = netdev_priv(hard_iface->soft_iface);
@@ -115,7 +116,8 @@ int batadv_send_skb_packet(struct sk_buff *skb,
* congestion and traffic shaping, it drops and returns NET_XMIT_DROP
* (which is > 0). This will not be treated as an error.
*/
- return net_xmit_eval(dev_queue_xmit(skb));
+ ret = dev_queue_xmit(skb);
+ return net_xmit_eval(ret);
send_skb_err:
kfree_skb(skb);
return NET_XMIT_DROP;