linux-kernel - net: free the sbs in skbufhead

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Date:   Mon, 12 Dec 2016 17:54:13 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     linux-rt-users@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        Steven Rostedt <rostedt@...dmis.org>
Subject: net: free the sbs in skbufhead

In "skbufhead-raw-lock.patch" we moved the memory to a list and the hunk that
cleared the list got misplaced.

Cc: stable@...r.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 net/core/dev.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5201,13 +5201,21 @@ static void net_rx_action(struct softirq
 	struct softnet_data *sd = this_cpu_ptr(&softnet_data);
 	unsigned long time_limit = jiffies + 2;
 	int budget = netdev_budget;
+	struct sk_buff_head tofree_q;
+	struct sk_buff *skb;
 	LIST_HEAD(list);
 	LIST_HEAD(repoll);
 
+	__skb_queue_head_init(&tofree_q);
+
 	local_irq_disable();
+	skb_queue_splice_init(&sd->tofree_queue, &tofree_q);
 	list_splice_init(&sd->poll_list, &list);
 	local_irq_enable();
 
+	while ((skb = __skb_dequeue(&tofree_q)))
+		kfree_skb(skb);
+
 	for (;;) {
 		struct napi_struct *n;