From: Bob Copeland Date: Thu, 5 Feb 2015 13:45:43 +0000 (-0500) Subject: mac80211_hwsim: fix error handling in tx_frame_nl X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f2831e2007810b690f93a26128058a193eadf393;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git mac80211_hwsim: fix error handling in tx_frame_nl Correct two problems with the error handling when using the netlink forwarding API: first, the netlink skb is never freed if nla_put() fails; and second, genlmsg_unicast() can fail if the netlink socket is full. In the latter case, the corresponding data skb is not counted as a drop and userspace programs like wmediumd will see TCP stalls due to lost packets. Signed-off-by: Bob Copeland Signed-off-by: Johannes Berg --- diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index 4a4c6586a8d2..8908be6dbc48 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -946,7 +946,8 @@ static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw, goto nla_put_failure; genlmsg_end(skb, msg_head); - genlmsg_unicast(&init_net, skb, dst_portid); + if (genlmsg_unicast(&init_net, skb, dst_portid)) + goto err_free_txskb; /* Enqueue the packet */ skb_queue_tail(&data->pending, my_skb); @@ -955,6 +956,8 @@ static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw, return; nla_put_failure: + nlmsg_free(skb); +err_free_txskb: printk(KERN_DEBUG "mac80211_hwsim: error occurred in %s\n", __func__); ieee80211_free_txskb(hw, my_skb); data->tx_failed++;